Background Nursery pigs undergo stressors in the post-weaning period that result in production and welfare chal-lenges.These challenges disproportionately impact the offspring of primiparous sows compared to those of ...Background Nursery pigs undergo stressors in the post-weaning period that result in production and welfare chal-lenges.These challenges disproportionately impact the offspring of primiparous sows compared to those of mul-tiparous counterparts.Little is known regarding potential interactions between parity and feed additives in the post-weaning period and their effects on nursery pig microbiomes.Therefore,the objective of this study was to investigate the effects of maternal parity on sow and offspring microbiomes and the influence of sow parity on pig fecal microbi-ome and performance in response to a prebiotic post-weaning.At weaning,piglets were allotted into three treat-ment groups:a standard nursery diet including pharmacological doses of Zn and Cu(Con),a group fed a commercial prebiotic only(Preb)based on an Aspergillus oryzae fermentation extract,and a group fed the same prebiotic plus Zn and Cu(Preb+ZnCu).Results Although there were no differences in vaginal microbiome composition between primiparous and mul-tiparous sows,fecal microbiome composition was different(R^(2)=0.02,P=0.03).The fecal microbiomes of primiparous offspring displayed significantly higher bacterial diversity compared to multiparous offspring at d 0 and d 21 post-weaning(P<0.01),with differences in community composition observed at d 21(R^(2)=0.03,P=0.04).When analyzing the effects of maternal parity within each treatment,only the Preb diet triggered significant microbiome distinc-tions between primiparous and multiparous offspring(d 21:R^(2)=0.13,P=0.01;d 42:R^(2)=0.19,P=0.001).Composi-tional differences in pig fecal microbiomes between treatments were observed only at d 21(R^(2)=0.12,P=0.001).Pigs in the Con group gained significantly more weight throughout the nursery period when compared to those in the Preb+ZnCu group.Conclusions Nursery pig gut microbiome composition was influenced by supplementation with an Aspergillus oryzae fermentation extract,with varying effects on performance when combined with pharmacological levels of Zn and Cu or for offspring of different maternal parity groups.These results indicate that the development of nursery pig gut microbiomes is shaped by maternal parity and potential interactions with the effects of dietary feed additives.展开更多
Background:This study was conducted to investigate the effects of each phytogenic feed additive(PFA;PFA1,bitter citrus extract;PFA2,a microencapsulated blend of thymol and carvacrol;PFA3,a mixture of bitter citrus ext...Background:This study was conducted to investigate the effects of each phytogenic feed additive(PFA;PFA1,bitter citrus extract;PFA2,a microencapsulated blend of thymol and carvacrol;PFA3,a mixture of bitter citrus extract,thymol,and carvacrol;PFA4,a premixture of grape seed,grape marc extract,green tea,and hops;PFA5,fenugreek seed powder)on the growth performance,nutrient digestibility,intestinal morphology,and immune response in weaned pigs infected with Escherichia coli(E.coli).Results:A total of 634-week-old weaned pigs were placed in individual metabolic cages and assigned to seven treatment groups.The seven treatments were as follows:1)NC;basal diet without E.coli challenge,2)PC;basal diet with E.coli challenge,3)T1;PC+0.04%PFA1,4)T2;PC+0.01%PFA2,5)T3;PC+0.10%PFA3,6)T4;PC+0.04%PFA4,7)T5;PC+0.10%PFA5.The experiments lasted in 21 d,including 7 d before and 14 d after the first E.coli challenge.In the E.coli challenge treatments,all pigs were orally inoculated by dividing a total of 10 mL of E.coli F18 for 3 consecutive days.The PFA-added groups significantly increased(P<0.05)average daily gain and feed efficiency and decreased(P<0.05)the fecal score at d 0 to 14 post-inoculation(PI).Tumor necrosis factorαwas significantly lower(P<0.05)in the PFA-added groups except for T1 in d 14 PI compared to the PC treatment.The T3 had a higher(P<0.05)immunoglobulin G and immunoglobulin A concentration compared to the PC treatment at d 7 PI.Also,T3 showed significantly higher(P<0.05)villus height:crypt depth and claudin 1 expression in ileal mucosa,and significantly downregulated(P<0.05)the expression of calprotectin compared to the PC treatment.Conclusions:Supplementation of PFA in weaned pigs challenged with E.coli alleviated the negative effects of E.coli and improved growth performance.Among them,the mixed additive of bitter citrus extract,thymol,and carvacrol showed the most effective results,improving immune response,intestinal morphology,and expression of tight junctions.展开更多
This paper summarizes the current knowledge regarding the possible modes of action and nutritional factors involved in the use of essential oils (EOs) for swine and poultry. EOs have recently attracted increased int...This paper summarizes the current knowledge regarding the possible modes of action and nutritional factors involved in the use of essential oils (EOs) for swine and poultry. EOs have recently attracted increased interest as feed additives to be fed to swine and poultry, possibly replacing the use of antibiotic growth promoters which have been prohibited in the European Union since 2006. In general, EOs enhance the production of digestive secretions and nutrient absorption, reduce pathogenic stress in the gut, exert antioxidant properties and reinforce the animal's immune status, which help to explain the enhanced performance observed in swine and poultry. However, the mechanisms involved in causing this growth promotion are far from being elucidated, since data on the complex gut ecosystem, gut function, in vivo oxidative status and immune system are still lacking. In addition, limited information is available regarding the interaction between EOs and feed ingredients or other feed additives (especially pro- or prebiotics and organic acids). This knowledge may help feed formulators to better utilize EOs when they formulate diets for poultry and swine.展开更多
[Objectives]To explore the effects of nano compound Chinese herbal medicine feed additive on growth performance,meat quality and disease resistance of chickens.[Methods]Chickens were fed with nano compound Chinese her...[Objectives]To explore the effects of nano compound Chinese herbal medicine feed additive on growth performance,meat quality and disease resistance of chickens.[Methods]Chickens were fed with nano compound Chinese herbal medicine feed additive developed by Hunan Polytechnic of Environment and Biology,including 120 chickens in the treatment group and 120 chickens in the control group(CK).The growth performance indices(body weight gain,feed to gain ratio and slaughter index),meat quality indices(pH value,color,drip loss,shear force)and disease resistance indices(morbidity and mortality)of the chickens in the treatment and CK groups were recorded and determined,respectively.[Results]The inclusion of 2%nano compound Chinese herbal medicine feed additive in the diet significantly increased the growth rate,reduced the feed-to-gain ratio and improved the meat quality of the chickens.Supplementing Chinese herbal medicine could increase the pH value and reduce the drip loss and shear force of chicken meat.At the same time,the body's immune function,antioxidant level and resistance against diseases of the chickens fed with nano compound Chinese herbal medicine feed additive were improved.[Conclusions]The inclusion of nano compound Chinese herbal medicine feed additive in the diet can improve the growth performance,meat quality and disease resistance of chickens.展开更多
[ Objective ] To investigate effects of Cordyceps feed additive on growth performance, laying rate and egg quality in laying ducks. [ Method] A total of 270 healthy laying ducks were randomly divided into throe groups...[ Objective ] To investigate effects of Cordyceps feed additive on growth performance, laying rate and egg quality in laying ducks. [ Method] A total of 270 healthy laying ducks were randomly divided into throe groups, 90 ducks in each group. The ducks in the control group, group I and group II were fed common basal diet, basal diet containing 10 g/kg Cordyceps feed additive and basal diet containing 40 g/kg Cordyceps feed additive, respectively. The trial lasted for 28 d. During the whole trial, the ducks were weighed and their growth was observed at an interval of 7 d. The exterior quality and the nutritive indexes of duck eggs were determined. [ Result] After experiments, the body weights of ducks in the group I and group II were increased and higher than that of the control group. In the group I and group II, the laying rate was increased by 1.07% and 2.15%, respectively; the egg weight was increased by 3.95% and 4.16%, respectively; and the feed to egg ratio was decreased by 2.54% and 4.23%, respectively. The egg shape and eggshell thickness were consistent between the control group and experimental groups. In the group I and group II, the protein content of the duck eggs was increased by 5.55% and 17.15%, respectively; the cholesterol content was decreased by 11.79% and 42.14%, respectively; the IgY level was increased by 13.20% and 27.97%, respectively; and the lecithin content was increased by 5.13% and 11.69%, respectively. [Condusion] The Cordyceps feed additive can increase the body weight and laying rate of laying ducks and improve the quality of duck eggs.展开更多
[Objective] The research aimed to explore the effects of comminution technology on the dissolution of active components from compound feed additive of Strobi/anthes cusia. [Method] Using active component adenosine in ...[Objective] The research aimed to explore the effects of comminution technology on the dissolution of active components from compound feed additive of Strobi/anthes cusia. [Method] Using active component adenosine in principal herb S. cusia and chlorogenic acid in minister drug Lonicera japonica Thunb. as dissolution indices,the effects of ultrafine comminution on the dissolution degree of compound feed additive of S. cusia were analyzed. [ Result] The dissolution degree of adenosine and chlorogenic acid in ultra micro particles were obviously higher than that of common particles. Ultrafine comminution could significantly quicken the dissolution rate of adenosine and chlorogenic acid in compound feed additive of S. cusia, shorten the extraction time, avoid the breakage of active components in long-time extraction process,and meanwhile saved the energy greatly. [ Conclusion] The ultrafine comminution technology could obviously increase the dissolution degree of active components in compound feed additive of S. cusia.展开更多
[ Objectivel To investigate the effects of three different levels of feed additives on fur production performance of Rex rabbit. [ Method] A total of 60 healthy American strain Rex rabbits at the age of 60 d (female...[ Objectivel To investigate the effects of three different levels of feed additives on fur production performance of Rex rabbit. [ Method] A total of 60 healthy American strain Rex rabbits at the age of 60 d (female:male =1:1 ) were randomly divided into group I, group II and group III. The Rex rabbits in the group I were fed basal diet containing nutritional substances; those in the group II were fed basal diet containing nutdtionai substances and Chinese herbal additive; and those in the group III were fed basal diet containing nutritional substances, Chinese herbal additive and enzyme. The trial lasted for 100 d. After slaughtering, the fur area, fur thickness, wool density, wool fineness and coarse wool rate were determined. [Result] The fur production performance of group III was significantly higher than that of group I ( P 〈 0.05). There was no significant difference between group III and group II. [ Conclusion] Supplementing Chinese herbal additive and enzyme in diet can improve the fur production performance of Rex rabbit.展开更多
[Objectives]This study was conducted to explore and rationally use the effective value and nutritional components of wolfberry polysaccharide to provide a basis for the use of new feed resources.[Methods]The premixed ...[Objectives]This study was conducted to explore and rationally use the effective value and nutritional components of wolfberry polysaccharide to provide a basis for the use of new feed resources.[Methods]The premixed feed prepared with the wolfberry polysaccharide additive was applied to fattening Tan sheep in Ningxia,and the effect of the wolfberry polysaccharide additive on the fattening Tan sheep was analyzed,so as to provide technical support for the rational utilization of the wolfberry polysaccharide resources.The study adopted a single-factor comparison method,selecting 84 tan sheep in the fattening period with conform gender,feeding management,weight,age,and physiological status,which were divided into 2 test groups and 1 control group,28 in each group.[Results]Within 90 d,the weight gain of the group with 0.1%wolfberry polysaccharide additive increased by 6.98%,showing a significant difference(P<0.05),and the feed conversion ratio decreased by 9.66%,which was significant as well(P<0.05).The gross profit of this group was 125.76 yuan,which was higher than the control group by 57.52 yuan.The group with 0.2%wolfberry polysaccharide additive increased the weight gain by 8.63%,which was significant(P<0.05),and the feed conversion ratio decreased by 10.80%,which was significant as well(P<0.05).The gross profit of group 2 was 125.76 yuan,which was higher than the control group by 63.41 yuan.There were no significant differences in weight gain,feed conversion ratio and gross profit between the groups with 0.1%and 0.2%of wolfberry polysaccharide additive.The results showed that the use of wolfberry polysaccharide additive premixed feed has a positive effect on increasing the weight gain of fattening Tan sheep,reducing the feed conversion ratio,and improving the feed conversion efficiency.The addition of 0.1%and 0.2%of the wolfberry polysaccharide additive premixed feed had no significant differences.[Conclusions]The wolfberry polysaccharide additive has a positive effect on increasing the weight gain of fattening Tan sheep,reducing the feed conversion ratio,and improving the feed conversion efficiency.展开更多
Skin colour is an important criterion in determining the aesthetic appeal of ornamental fishes,and thus their market worth.Hence the pigment enhancement in ornamental fishes has been the subject of extensive research ...Skin colour is an important criterion in determining the aesthetic appeal of ornamental fishes,and thus their market worth.Hence the pigment enhancement in ornamental fishes has been the subject of extensive research by using various synthetic as well as natural pigment sources.Dietary composition is one of the most important elements that influence the development of pigmentation in fish.This study is an attempt to assess the possibility of using carotenogenic marine yeast as pigment enhancer in fish diet for Koi carp,Cyprinus carpio.The 60 days feeding experiment was done by using feed incorporated with mangrove associated marine yeast Rhodotorula paludigena VA242.Greater pigmentation in the scales of fishes fed with experimental feed was observed than that fed with the control diet(normal pellet feed).Furthermore the improved growth rate and general wellbeing in fishes fed with experimental feed provides scope for further studies in this field with respect to the growth and survival of fishes.展开更多
Background:Antibiotic growth promoters are widely used to improve weight gain.However,the abuse of antibiotics can have many negative effects on people.Developing alternatives to antibiotics is an urgent need in lives...Background:Antibiotic growth promoters are widely used to improve weight gain.However,the abuse of antibiotics can have many negative effects on people.Developing alternatives to antibiotics is an urgent need in livestock production.We aimed to perform a meta-analysis and network meta-analysis(NMA)to investigate the effects of feed additives as potential antibiotic substitutes(ASs)on bacteriostasis,growth performance,intestinal morphology and immunity.Furthermore,the primary,secondary,and tertiary ASs were defined by comparing their results with the results of antibiotics.Results:Among 16,309 identified studies,37 were summarized to study the bacteriostasis effects of feed additives,and 89 were included in the meta-analysis and NMA(10,228 pigs).We summarized 268 associations of 57 interventions with 32 bacteria.The order of bacteriostasis effects was as follows:antimicrobial peptides(AMPs)≈antibiotics>organic acids>plant extracts>oligosaccharides.We detected associations of 11 feed additives and 11 outcomes.Compared with a basal diet,plant extract,AMPs,probiotics,microelements,organic acids,bacteriophages,lysozyme,zymin,and oligosaccharides significantly improved growth performance(P<0.05);organic acids,probiotics,microelements,lysozyme,and AMPs remarkably increased the villus height:crypt depth ratio(V/C)(P<0.05);and plant extracts,zymin,microelements,probiotics,and organic acids notably improved immunity(P<0.05).The optimal AMP,bacteriophage,lysozyme,microelements,oligosaccharides,organic acids,plants,plant extracts,probiotics,and zymin doses were 0.100%,0.150%,0.012%,0.010%,0.050%,0.750%,0.20%,0.040%,0.180%,and 0.100%,respectively.Compared with antibiotics,all investigated feed additives exhibited no significant difference in effects on growth performance,IgG,and diarrhoea index/rate(P>0.05);AMPs and microelements significantly increased V/C(P<0.05);and zymin significantly improved lymphocyte levels(P<0.05).Furthermore,linear weighting sum models were used to comprehensively estimate the overall impact of each feed additive on pig growth and health.Conclusions:Our findings suggest that AMPs and plant extracts can be used as primary ASs for weaned piglets and growing pigs,respectively.Bacteriophages,zymin,plants,probiotics,oligosaccharides,lysozyme,and microelements can be regarded as secondary ASs.Nucleotides and organic acids can be considered as tertiary ASs.Future studies should further assess the alternative effects of combinational feed additives.展开更多
Coarse columnar β grains result in anisotropic mechanical properties in Ti alloys deposited by additive manufacturing. This study reports that Ti-6Al-4V alloy fabricated by coaxial electron beam wire feeding additive...Coarse columnar β grains result in anisotropic mechanical properties in Ti alloys deposited by additive manufacturing. This study reports that Ti-6Al-4V alloy fabricated by coaxial electron beam wire feeding additive manufacturing presents a weak anisotropy, high strength and ductility. The superior tensile property arises from a microstructure with fine equiaxed β grains(EGβ), discontinuous grain boundary α phase and short intragranular α lamellae. A large region of fine EGβ arises from a special combination of the temperature gradient and solidification rate, and attractive α morphology is caused by solid phase transformations during interpass thermal cycling and post heat treatments.展开更多
Clays are crystalline, hydrated aluminosilicate molecules composed of alkali and alkaline earth cations along with small amounts of various other elements. The best-known are montmorillonite, smectite, illite, kaolini...Clays are crystalline, hydrated aluminosilicate molecules composed of alkali and alkaline earth cations along with small amounts of various other elements. The best-known are montmorillonite, smectite, illite, kaolinite, biotite and clinoptilolite. The molecules in these clays are arranged in three-dimensional structures creating internal voids and channels capable of trapping a wide variety of molecules. As a result of this structure, clay minerals are regarded as a simple and effective tool for the prevention of the negative effects of many toxic compounds. Dietary supplementation with clays has been shown to improve weight gain and feed conversion in pigs. Where improvements in performance have been noted, one of the most likely explanations for the improvement is the fact clays increase nutrient digestibility. Clays reduce the speed of passage of feed along the digestive tract which allows more time for digestion. Feeding clays also causes morphological changes in the intestina mucosa such as an increase in villus height and an increase in the villus height to crypt depth ratio. These changes increase the surface area of the gastrointestinal tract thus increasing nutrient digestibility, Several studies have indicated that feeding clay reduces the incidence, severity and duration of diarrhea in pigs. The mechanism for the reduction in diarrhea is likely due to increases in the numbers of Bifidobacteria and Lactobacillus and decreases in Clostridia and E. coil in the small intestine of pigs fed clays. In addition, the numbers of pigs born alive and weaned, birth weight and weaning weight have been shown to be higher for sows fed clays. Several studies have indicated that clays can help mitigate the effects of mycotoxins. The aim of the present review is to focus on the various clays which have been given attention in recent research and to discuss their potential to improve pig performance.展开更多
As a bioactive substance, phytosterol reduces blood cholesterol and the risk of cardiovascular disease. It also has such physiological functions as growth regulation, promotion of protein synthesis, anti-inflammatory,...As a bioactive substance, phytosterol reduces blood cholesterol and the risk of cardiovascular disease. It also has such physiological functions as growth regulation, promotion of protein synthesis, anti-inflammatory, antioxidant, anticancer, immune regulation and hormone-like effects. Phytosterol does not show any toxicity to human and animals, and it is a new functional feed additive approved by the Ministry of Agriculture of China. This article generally reviewed the physiological function of phytosterol like regulation of cholesterol metabolism, antioxidation, hormone-like effects, and its application on animal, production like hypolipidemic and improving dairy animals' milk composition. The paper provides a reference for wide application of phytosterol in animal feed.展开更多
The aim of this work was to compare the efficacy of a commercially available phytogenic feed additive(PFA) and an antibiotic growth promoter, which was bacitracin methylene disalicylate(BMD), on performance, nutrient ...The aim of this work was to compare the efficacy of a commercially available phytogenic feed additive(PFA) and an antibiotic growth promoter, which was bacitracin methylene disalicylate(BMD), on performance, nutrient retention, caecal colonization of bacteria and humoral immune responses against Newcastle disease in broiler chickens challenged orally with Salmonella enteritidis and Escherichia coli.One-day-old male Cobb 400 broiler chicks(n = 120) were fed with 1) a negative control(NC) diet, which is the basal diet without any added growth promoter, 2) a positive control(PC) diet, the basal diet supplemented with BMD, 500 mg/kg and 3) a diet supplemented with PFA(150 mg/kg) for 39 days and the birds were inoculated with S. enteritidis and E. coli on d 28. Supplementation of PFA improved body weight, feed conversion ratio, retention of N and crude fiber, increased fecal moisture content and decreased digesta transit time as compared with the NC and PC groups(P <0.01). Both the PC and the PFA was found to be equally effective in controlling the surge in numbers of Salmonella and E. coli following oral inoculation of these bacteria as compared with the NC group(P <0.05) at 24 h past inoculation. Caecal content analysis on d 39 indicated lower numbers of Salmonella, E. coli and Clostridium in the PC and PFA groups as compared with the NC group(P <0.05). The number of Lactobacillus in the PFA group was higher than those in the NC and PC groups(P <0.05). Humoral immune response,measured as hemagglutination inhibition titer against Newcastle disease, was better in the PC and PFA groups compared with the NC group(P <0.05) at d 21 but the difference did not last till d 39. The heterophil to lymphocyte ratio was narrower(P <0.001) and alkaline phosphatase activity was higher(P <0.01) in the PFA group as compared with the NC and PC groups on d 39. It was concluded that the PFA, which is animal, environment and consumer friendly, may be used as an effective replacement for common in-feed antibiotics like BMD to enhance broiler performance especially when the birds are exposed to heavy infections on fields.展开更多
Modern aquaculture must be sustainable in terms of energy consumption, raw materials used, and environmental impact, so alternatives are needed to replace fish feed with other raw materials. Enzyme use in the agri-foo...Modern aquaculture must be sustainable in terms of energy consumption, raw materials used, and environmental impact, so alternatives are needed to replace fish feed with other raw materials. Enzyme use in the agri-food industry is based on their efficiency, safety, and protection of the environment, which aligns with the requirements of a resource-saving production system. Enzyme supplementation in fish feed can improve digestibility and absorption of both plant- and animal-derived ingredients, increasing the growth parameters of aquacultural animals. Herein we summarized the recent literature that reported the use of digestive enzymes (amylases, lipases, proteases, cellulases, and hemicellulases) and non-digestive enzymes (phytases, glucose oxidase, and lysozyme) in fish feed. In addition, we analyzed how critical steps of the pelleting process, including microencapsulation and immobilization, can interfere with enzyme activity in the final fish feed product.展开更多
Feed security is a prerequisite for safe animal food products.In this study,13 groups of feed and feed ingredients,totaling 2067 samples,were collected in the period of 2011 to 2014 from China.The highest mean level o...Feed security is a prerequisite for safe animal food products.In this study,13 groups of feed and feed ingredients,totaling 2067 samples,were collected in the period of 2011 to 2014 from China.The highest mean level of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs) was found in fish meals and shell powders,with a concentration of 60.35 ng/kg,followed by mineral origin materials.In terms of the toxicity equivalent concentration,the fish oil group showed the highest PCDD/F levels because of their bio-accumulation through the aquatic food chain,with an average concentration of 1.26 ng WHO-TEQ/kg,while the lowest level was observed in compound feed for chickens and pigs,with an average value of0.16 ng WHO-TEQ/kg.OCDD and OCDF were the predominant congeners in all groups except fish oils,in which the primary congeners were 2,3,4,7,8-PeCDF and 2,3,7,8-TCDF.For zinc chloride samples,different from other zinc-based compound samples,the main congeners were 1,2,3,4,6,7,8-HpCDF(17%),1,2,3,4,7,8,9-HpCDF(15%),1,2,3,4,7,8-HxCDF(12%) and OCDF(30%).Considering toxicity equivalency factors,the dominant congeners were 2,3,4,7,8-PeCDF,1,2,3,4,7,8-HxCDF,2,3,7,8-TCDF and 1,2,3,7,8-PeCDD,and the contribution to the total TEQwas29%,16%,14%and 12%,respectively.Overall,2.1%(43 out of 2067) of all the analyzed samples exceeded the different individual 'European Union maximum limited levels for PCDD/Fs.This study is beneficial for the determination of the status of contamination levels of feed and feed ingredients.展开更多
Forty-two (42) finishing pigs (entire males—EM, surgical castrates—SC and gilts—G, each of 14)—progeny of Landracesows and Hampshire × Pietrain boars, were included in the trial. They were randomly divided in...Forty-two (42) finishing pigs (entire males—EM, surgical castrates—SC and gilts—G, each of 14)—progeny of Landracesows and Hampshire × Pietrain boars, were included in the trial. They were randomly divided into control and experimental groups(each of seven). Control groups were fed the standard diet without any supplement. Experimental groups received standard diet withthe same composition as control but with supplement of creatine monohydrate (CMH, 2.0 g/kg of feed) for 30 d prior to slaughter.Sex of pigs had significant effect (p < 0.05) on drip loss and tenderness of pork when EM showed higher drip loss than SC and lowertenderness compared to other two groups (4.71% vs. 3.80%, resp. 3.23 vs. 3.91 and 4.12). Creatine level in plasma was increased byCMH supplementation in 46% in EM, 43% in SC and 41% in G. Similarly, concentration of phosphocreatine (PCr) in muscleincreased in 84% in EM, 88% in SC and 83% in G, respectively. CMH also improved meat colour L* (50.03 vs. 48.88) and reduceddrip loss in both EM (5.24% vs. 4.18%) and G (4.48% vs. 3.60%). Higher tenderness and better oxidative stability of pork after CMHsupplementation was found in all three sexes.展开更多
With the rapid development of large-scale pig breeding,the problem of environmental pollution around pig farms has become increasingly serious,of which copper pollution has become particularly prominent. Plants such a...With the rapid development of large-scale pig breeding,the problem of environmental pollution around pig farms has become increasingly serious,of which copper pollution has become particularly prominent. Plants such as Leerisia Orygides L.,Eichhornia crassipes( Mart.) Solms,Commelina communis L.,and Rumex acetosa L. that have strong ability to absorb and transform copper can be used to build constructed wetlands to absorb copper in pig waste,and it can be used as a feed additive to be recycled,which can prevent a larger range of pollution caused by the migration and diffusion of copper.展开更多
<span style="font-family:Verdana;">In order to contribute to the improvement of the knowledge on the</span><span><span><span style="font-family:;" "="">...<span style="font-family:Verdana;">In order to contribute to the improvement of the knowledge on the</span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;"> valorization of biochar as a feed additive in livestock, three biochar made from cassava peelings, bean tops and cocoa pods were manufactured. After analyzing their mineral composition, they were incorporated into rations at a rate of 0.8% in order to evaluate their effects on the performance of reproduction and pre-weaning growth in cavy (</span><i><i><span style="font-family:Verdana;">Cavia</span></i><span> <i><span style="font-family:Verdana;">porcellus</span></i><span style="font-family:Verdana;"></span></span></i></span></span><span style="font-family:Verdana;">). The trials were conducted in the Research Unit of Animal Production and Nutrition (URPRONAN) of the University of Dschang, on 96 adult local breed cavy (from the first generation), including 80 females and 16 males aged 4 months and with an average weight of 400 ± 0.25 g. After 2 weeks of adaptation in the rearing boxes at the farm, the females were put in reproduction for a period of 31 days, the animals were divided into 04 batches of 20 females and 4 males. The animals in the control lot were fed a compound feed without biochar (T) while the oth</span><span style="font-family:Verdana;">ers were fed the compound feed containing 0.8% of cassava peel biochar</span><span style="font-family:Verdana;"> (EM), 0.8% of bean tops biochar (FH) and 0.8% of cocoa pod husks biochar (CC) respectively. The results of this study showed that the ash content (26%) and macro-element concentration were higher in the bean husk charcoal compared to the other charcoals and the trace elements were more concentrated in the cassava peel charcoal. The best fertility rate (87.5%) was obtained in </span><span style="font-family:Verdana;">animals receiving the ration containing organic cocoa pod charcoal. The</span><span style="font-family:Verdana;"> highest abortion rate (63.16%) was obtained in the batch of animals receiving the </span><span style="font-family:Verdana;">ration containing organic bean husk charcoal. Pre-weaning mortality rates </span><span style="font-family:Verdana;">were comparable between the different rations. Piglet weights at birth were comparable between the different rations. At weaning, the highest average weight of the kids was recorded with the ration containing the organic bean charcoal (197.25 ± 46.9 g). The highest ADG (4.82 ± 0.74 g/d) and TG (101.25 g) were recorded in the batch of animals receiving the FH ration. Thus, the incorporation of 0.8% of the powder of organic coals seems to have adverse effects on reproductive performance. On the other hand, these coals significantly improve the pre-weaning growth performance in cavy.</span></span>展开更多
基金This study was partially supported by funds from the Agricultural Research,Education,Extension and Technology Transfer(AGREETT)and MNDrive Global Food Ventures Programs,both from the University of MinnesotaPartial funding was supplied by BioZyme,Inc,St.Joseph,Missouri,USA and New Fashion Pork,Jackson,MN,USA.
文摘Background Nursery pigs undergo stressors in the post-weaning period that result in production and welfare chal-lenges.These challenges disproportionately impact the offspring of primiparous sows compared to those of mul-tiparous counterparts.Little is known regarding potential interactions between parity and feed additives in the post-weaning period and their effects on nursery pig microbiomes.Therefore,the objective of this study was to investigate the effects of maternal parity on sow and offspring microbiomes and the influence of sow parity on pig fecal microbi-ome and performance in response to a prebiotic post-weaning.At weaning,piglets were allotted into three treat-ment groups:a standard nursery diet including pharmacological doses of Zn and Cu(Con),a group fed a commercial prebiotic only(Preb)based on an Aspergillus oryzae fermentation extract,and a group fed the same prebiotic plus Zn and Cu(Preb+ZnCu).Results Although there were no differences in vaginal microbiome composition between primiparous and mul-tiparous sows,fecal microbiome composition was different(R^(2)=0.02,P=0.03).The fecal microbiomes of primiparous offspring displayed significantly higher bacterial diversity compared to multiparous offspring at d 0 and d 21 post-weaning(P<0.01),with differences in community composition observed at d 21(R^(2)=0.03,P=0.04).When analyzing the effects of maternal parity within each treatment,only the Preb diet triggered significant microbiome distinc-tions between primiparous and multiparous offspring(d 21:R^(2)=0.13,P=0.01;d 42:R^(2)=0.19,P=0.001).Composi-tional differences in pig fecal microbiomes between treatments were observed only at d 21(R^(2)=0.12,P=0.001).Pigs in the Con group gained significantly more weight throughout the nursery period when compared to those in the Preb+ZnCu group.Conclusions Nursery pig gut microbiome composition was influenced by supplementation with an Aspergillus oryzae fermentation extract,with varying effects on performance when combined with pharmacological levels of Zn and Cu or for offspring of different maternal parity groups.These results indicate that the development of nursery pig gut microbiomes is shaped by maternal parity and potential interactions with the effects of dietary feed additives.
基金carried out with the support of“Cooperative Research Program for Agriculture Science&Technology Development(Project No.PJ01622001)”Rural Development Administration,Korea。
文摘Background:This study was conducted to investigate the effects of each phytogenic feed additive(PFA;PFA1,bitter citrus extract;PFA2,a microencapsulated blend of thymol and carvacrol;PFA3,a mixture of bitter citrus extract,thymol,and carvacrol;PFA4,a premixture of grape seed,grape marc extract,green tea,and hops;PFA5,fenugreek seed powder)on the growth performance,nutrient digestibility,intestinal morphology,and immune response in weaned pigs infected with Escherichia coli(E.coli).Results:A total of 634-week-old weaned pigs were placed in individual metabolic cages and assigned to seven treatment groups.The seven treatments were as follows:1)NC;basal diet without E.coli challenge,2)PC;basal diet with E.coli challenge,3)T1;PC+0.04%PFA1,4)T2;PC+0.01%PFA2,5)T3;PC+0.10%PFA3,6)T4;PC+0.04%PFA4,7)T5;PC+0.10%PFA5.The experiments lasted in 21 d,including 7 d before and 14 d after the first E.coli challenge.In the E.coli challenge treatments,all pigs were orally inoculated by dividing a total of 10 mL of E.coli F18 for 3 consecutive days.The PFA-added groups significantly increased(P<0.05)average daily gain and feed efficiency and decreased(P<0.05)the fecal score at d 0 to 14 post-inoculation(PI).Tumor necrosis factorαwas significantly lower(P<0.05)in the PFA-added groups except for T1 in d 14 PI compared to the PC treatment.The T3 had a higher(P<0.05)immunoglobulin G and immunoglobulin A concentration compared to the PC treatment at d 7 PI.Also,T3 showed significantly higher(P<0.05)villus height:crypt depth and claudin 1 expression in ileal mucosa,and significantly downregulated(P<0.05)the expression of calprotectin compared to the PC treatment.Conclusions:Supplementation of PFA in weaned pigs challenged with E.coli alleviated the negative effects of E.coli and improved growth performance.Among them,the mixed additive of bitter citrus extract,thymol,and carvacrol showed the most effective results,improving immune response,intestinal morphology,and expression of tight junctions.
文摘This paper summarizes the current knowledge regarding the possible modes of action and nutritional factors involved in the use of essential oils (EOs) for swine and poultry. EOs have recently attracted increased interest as feed additives to be fed to swine and poultry, possibly replacing the use of antibiotic growth promoters which have been prohibited in the European Union since 2006. In general, EOs enhance the production of digestive secretions and nutrient absorption, reduce pathogenic stress in the gut, exert antioxidant properties and reinforce the animal's immune status, which help to explain the enhanced performance observed in swine and poultry. However, the mechanisms involved in causing this growth promotion are far from being elucidated, since data on the complex gut ecosystem, gut function, in vivo oxidative status and immune system are still lacking. In addition, limited information is available regarding the interaction between EOs and feed ingredients or other feed additives (especially pro- or prebiotics and organic acids). This knowledge may help feed formulators to better utilize EOs when they formulate diets for poultry and swine.
基金Project of Hunan Province for Science of Education during 13th Five-Year Plan Period[XJK18BZY066]Hengyang Social Science Foundation Project[2017B(1)010].
文摘[Objectives]To explore the effects of nano compound Chinese herbal medicine feed additive on growth performance,meat quality and disease resistance of chickens.[Methods]Chickens were fed with nano compound Chinese herbal medicine feed additive developed by Hunan Polytechnic of Environment and Biology,including 120 chickens in the treatment group and 120 chickens in the control group(CK).The growth performance indices(body weight gain,feed to gain ratio and slaughter index),meat quality indices(pH value,color,drip loss,shear force)and disease resistance indices(morbidity and mortality)of the chickens in the treatment and CK groups were recorded and determined,respectively.[Results]The inclusion of 2%nano compound Chinese herbal medicine feed additive in the diet significantly increased the growth rate,reduced the feed-to-gain ratio and improved the meat quality of the chickens.Supplementing Chinese herbal medicine could increase the pH value and reduce the drip loss and shear force of chicken meat.At the same time,the body's immune function,antioxidant level and resistance against diseases of the chickens fed with nano compound Chinese herbal medicine feed additive were improved.[Conclusions]The inclusion of nano compound Chinese herbal medicine feed additive in the diet can improve the growth performance,meat quality and disease resistance of chickens.
基金funded by the Key Science and Technology Project of Anhui Province in 2008 (08010302085)the Agricultural Science and Technology Achievements Transformation Fund Programs of the Ministry of Science and Technology of the People's Republic of China (2008GB2C300131)
文摘[ Objective ] To investigate effects of Cordyceps feed additive on growth performance, laying rate and egg quality in laying ducks. [ Method] A total of 270 healthy laying ducks were randomly divided into throe groups, 90 ducks in each group. The ducks in the control group, group I and group II were fed common basal diet, basal diet containing 10 g/kg Cordyceps feed additive and basal diet containing 40 g/kg Cordyceps feed additive, respectively. The trial lasted for 28 d. During the whole trial, the ducks were weighed and their growth was observed at an interval of 7 d. The exterior quality and the nutritive indexes of duck eggs were determined. [ Result] After experiments, the body weights of ducks in the group I and group II were increased and higher than that of the control group. In the group I and group II, the laying rate was increased by 1.07% and 2.15%, respectively; the egg weight was increased by 3.95% and 4.16%, respectively; and the feed to egg ratio was decreased by 2.54% and 4.23%, respectively. The egg shape and eggshell thickness were consistent between the control group and experimental groups. In the group I and group II, the protein content of the duck eggs was increased by 5.55% and 17.15%, respectively; the cholesterol content was decreased by 11.79% and 42.14%, respectively; the IgY level was increased by 13.20% and 27.97%, respectively; and the lecithin content was increased by 5.13% and 11.69%, respectively. [Condusion] The Cordyceps feed additive can increase the body weight and laying rate of laying ducks and improve the quality of duck eggs.
基金funded by Guangdong Science and Technology Study Program(2010B090400529)
文摘[Objective] The research aimed to explore the effects of comminution technology on the dissolution of active components from compound feed additive of Strobi/anthes cusia. [Method] Using active component adenosine in principal herb S. cusia and chlorogenic acid in minister drug Lonicera japonica Thunb. as dissolution indices,the effects of ultrafine comminution on the dissolution degree of compound feed additive of S. cusia were analyzed. [ Result] The dissolution degree of adenosine and chlorogenic acid in ultra micro particles were obviously higher than that of common particles. Ultrafine comminution could significantly quicken the dissolution rate of adenosine and chlorogenic acid in compound feed additive of S. cusia, shorten the extraction time, avoid the breakage of active components in long-time extraction process,and meanwhile saved the energy greatly. [ Conclusion] The ultrafine comminution technology could obviously increase the dissolution degree of active components in compound feed additive of S. cusia.
基金supported by Science and Technology Development Projects of Hebei Province (06220404)
文摘[ Objectivel To investigate the effects of three different levels of feed additives on fur production performance of Rex rabbit. [ Method] A total of 60 healthy American strain Rex rabbits at the age of 60 d (female:male =1:1 ) were randomly divided into group I, group II and group III. The Rex rabbits in the group I were fed basal diet containing nutritional substances; those in the group II were fed basal diet containing nutdtionai substances and Chinese herbal additive; and those in the group III were fed basal diet containing nutritional substances, Chinese herbal additive and enzyme. The trial lasted for 100 d. After slaughtering, the fur area, fur thickness, wool density, wool fineness and coarse wool rate were determined. [Result] The fur production performance of group III was significantly higher than that of group I ( P 〈 0.05). There was no significant difference between group III and group II. [ Conclusion] Supplementing Chinese herbal additive and enzyme in diet can improve the fur production performance of Rex rabbit.
基金Ningxia Key R&D Planning Project(2019BBF02016)Special Scientific and Technological Achievement Transformation Project for Independent Innovation of Agricultural Science and Technology of Ningxia Academy of Agriculture and Forestry Sciences。
文摘[Objectives]This study was conducted to explore and rationally use the effective value and nutritional components of wolfberry polysaccharide to provide a basis for the use of new feed resources.[Methods]The premixed feed prepared with the wolfberry polysaccharide additive was applied to fattening Tan sheep in Ningxia,and the effect of the wolfberry polysaccharide additive on the fattening Tan sheep was analyzed,so as to provide technical support for the rational utilization of the wolfberry polysaccharide resources.The study adopted a single-factor comparison method,selecting 84 tan sheep in the fattening period with conform gender,feeding management,weight,age,and physiological status,which were divided into 2 test groups and 1 control group,28 in each group.[Results]Within 90 d,the weight gain of the group with 0.1%wolfberry polysaccharide additive increased by 6.98%,showing a significant difference(P<0.05),and the feed conversion ratio decreased by 9.66%,which was significant as well(P<0.05).The gross profit of this group was 125.76 yuan,which was higher than the control group by 57.52 yuan.The group with 0.2%wolfberry polysaccharide additive increased the weight gain by 8.63%,which was significant(P<0.05),and the feed conversion ratio decreased by 10.80%,which was significant as well(P<0.05).The gross profit of group 2 was 125.76 yuan,which was higher than the control group by 63.41 yuan.There were no significant differences in weight gain,feed conversion ratio and gross profit between the groups with 0.1%and 0.2%of wolfberry polysaccharide additive.The results showed that the use of wolfberry polysaccharide additive premixed feed has a positive effect on increasing the weight gain of fattening Tan sheep,reducing the feed conversion ratio,and improving the feed conversion efficiency.The addition of 0.1%and 0.2%of the wolfberry polysaccharide additive premixed feed had no significant differences.[Conclusions]The wolfberry polysaccharide additive has a positive effect on increasing the weight gain of fattening Tan sheep,reducing the feed conversion ratio,and improving the feed conversion efficiency.
基金the Kerala State Council for Science,Technology and Environment (KSCSTE) [Order No 573/2017/KSCSTE DTD October 03,2017] for the financial support.
文摘Skin colour is an important criterion in determining the aesthetic appeal of ornamental fishes,and thus their market worth.Hence the pigment enhancement in ornamental fishes has been the subject of extensive research by using various synthetic as well as natural pigment sources.Dietary composition is one of the most important elements that influence the development of pigmentation in fish.This study is an attempt to assess the possibility of using carotenogenic marine yeast as pigment enhancer in fish diet for Koi carp,Cyprinus carpio.The 60 days feeding experiment was done by using feed incorporated with mangrove associated marine yeast Rhodotorula paludigena VA242.Greater pigmentation in the scales of fishes fed with experimental feed was observed than that fed with the control diet(normal pellet feed).Furthermore the improved growth rate and general wellbeing in fishes fed with experimental feed provides scope for further studies in this field with respect to the growth and survival of fishes.
基金supported by the Key Program of the National Natural Science Foundation of China(3163000269)National Special Fund for Modern Industrial Technology System(CARS-35)Major Science and Technology Special Fund of Zhejiang Province(2015C02022)。
文摘Background:Antibiotic growth promoters are widely used to improve weight gain.However,the abuse of antibiotics can have many negative effects on people.Developing alternatives to antibiotics is an urgent need in livestock production.We aimed to perform a meta-analysis and network meta-analysis(NMA)to investigate the effects of feed additives as potential antibiotic substitutes(ASs)on bacteriostasis,growth performance,intestinal morphology and immunity.Furthermore,the primary,secondary,and tertiary ASs were defined by comparing their results with the results of antibiotics.Results:Among 16,309 identified studies,37 were summarized to study the bacteriostasis effects of feed additives,and 89 were included in the meta-analysis and NMA(10,228 pigs).We summarized 268 associations of 57 interventions with 32 bacteria.The order of bacteriostasis effects was as follows:antimicrobial peptides(AMPs)≈antibiotics>organic acids>plant extracts>oligosaccharides.We detected associations of 11 feed additives and 11 outcomes.Compared with a basal diet,plant extract,AMPs,probiotics,microelements,organic acids,bacteriophages,lysozyme,zymin,and oligosaccharides significantly improved growth performance(P<0.05);organic acids,probiotics,microelements,lysozyme,and AMPs remarkably increased the villus height:crypt depth ratio(V/C)(P<0.05);and plant extracts,zymin,microelements,probiotics,and organic acids notably improved immunity(P<0.05).The optimal AMP,bacteriophage,lysozyme,microelements,oligosaccharides,organic acids,plants,plant extracts,probiotics,and zymin doses were 0.100%,0.150%,0.012%,0.010%,0.050%,0.750%,0.20%,0.040%,0.180%,and 0.100%,respectively.Compared with antibiotics,all investigated feed additives exhibited no significant difference in effects on growth performance,IgG,and diarrhoea index/rate(P>0.05);AMPs and microelements significantly increased V/C(P<0.05);and zymin significantly improved lymphocyte levels(P<0.05).Furthermore,linear weighting sum models were used to comprehensively estimate the overall impact of each feed additive on pig growth and health.Conclusions:Our findings suggest that AMPs and plant extracts can be used as primary ASs for weaned piglets and growing pigs,respectively.Bacteriophages,zymin,plants,probiotics,oligosaccharides,lysozyme,and microelements can be regarded as secondary ASs.Nucleotides and organic acids can be considered as tertiary ASs.Future studies should further assess the alternative effects of combinational feed additives.
基金supported by the internal funding source from University of Shanghai for Science and Technology.
文摘Coarse columnar β grains result in anisotropic mechanical properties in Ti alloys deposited by additive manufacturing. This study reports that Ti-6Al-4V alloy fabricated by coaxial electron beam wire feeding additive manufacturing presents a weak anisotropy, high strength and ductility. The superior tensile property arises from a microstructure with fine equiaxed β grains(EGβ), discontinuous grain boundary α phase and short intragranular α lamellae. A large region of fine EGβ arises from a special combination of the temperature gradient and solidification rate, and attractive α morphology is caused by solid phase transformations during interpass thermal cycling and post heat treatments.
文摘Clays are crystalline, hydrated aluminosilicate molecules composed of alkali and alkaline earth cations along with small amounts of various other elements. The best-known are montmorillonite, smectite, illite, kaolinite, biotite and clinoptilolite. The molecules in these clays are arranged in three-dimensional structures creating internal voids and channels capable of trapping a wide variety of molecules. As a result of this structure, clay minerals are regarded as a simple and effective tool for the prevention of the negative effects of many toxic compounds. Dietary supplementation with clays has been shown to improve weight gain and feed conversion in pigs. Where improvements in performance have been noted, one of the most likely explanations for the improvement is the fact clays increase nutrient digestibility. Clays reduce the speed of passage of feed along the digestive tract which allows more time for digestion. Feeding clays also causes morphological changes in the intestina mucosa such as an increase in villus height and an increase in the villus height to crypt depth ratio. These changes increase the surface area of the gastrointestinal tract thus increasing nutrient digestibility, Several studies have indicated that feeding clay reduces the incidence, severity and duration of diarrhea in pigs. The mechanism for the reduction in diarrhea is likely due to increases in the numbers of Bifidobacteria and Lactobacillus and decreases in Clostridia and E. coil in the small intestine of pigs fed clays. In addition, the numbers of pigs born alive and weaned, birth weight and weaning weight have been shown to be higher for sows fed clays. Several studies have indicated that clays can help mitigate the effects of mycotoxins. The aim of the present review is to focus on the various clays which have been given attention in recent research and to discuss their potential to improve pig performance.
基金Supported by Major Project of National Spark Program(2011GA650001)
文摘As a bioactive substance, phytosterol reduces blood cholesterol and the risk of cardiovascular disease. It also has such physiological functions as growth regulation, promotion of protein synthesis, anti-inflammatory, antioxidant, anticancer, immune regulation and hormone-like effects. Phytosterol does not show any toxicity to human and animals, and it is a new functional feed additive approved by the Ministry of Agriculture of China. This article generally reviewed the physiological function of phytosterol like regulation of cholesterol metabolism, antioxidation, hormone-like effects, and its application on animal, production like hypolipidemic and improving dairy animals' milk composition. The paper provides a reference for wide application of phytosterol in animal feed.
文摘The aim of this work was to compare the efficacy of a commercially available phytogenic feed additive(PFA) and an antibiotic growth promoter, which was bacitracin methylene disalicylate(BMD), on performance, nutrient retention, caecal colonization of bacteria and humoral immune responses against Newcastle disease in broiler chickens challenged orally with Salmonella enteritidis and Escherichia coli.One-day-old male Cobb 400 broiler chicks(n = 120) were fed with 1) a negative control(NC) diet, which is the basal diet without any added growth promoter, 2) a positive control(PC) diet, the basal diet supplemented with BMD, 500 mg/kg and 3) a diet supplemented with PFA(150 mg/kg) for 39 days and the birds were inoculated with S. enteritidis and E. coli on d 28. Supplementation of PFA improved body weight, feed conversion ratio, retention of N and crude fiber, increased fecal moisture content and decreased digesta transit time as compared with the NC and PC groups(P <0.01). Both the PC and the PFA was found to be equally effective in controlling the surge in numbers of Salmonella and E. coli following oral inoculation of these bacteria as compared with the NC group(P <0.05) at 24 h past inoculation. Caecal content analysis on d 39 indicated lower numbers of Salmonella, E. coli and Clostridium in the PC and PFA groups as compared with the NC group(P <0.05). The number of Lactobacillus in the PFA group was higher than those in the NC and PC groups(P <0.05). Humoral immune response,measured as hemagglutination inhibition titer against Newcastle disease, was better in the PC and PFA groups compared with the NC group(P <0.05) at d 21 but the difference did not last till d 39. The heterophil to lymphocyte ratio was narrower(P <0.001) and alkaline phosphatase activity was higher(P <0.01) in the PFA group as compared with the NC and PC groups on d 39. It was concluded that the PFA, which is animal, environment and consumer friendly, may be used as an effective replacement for common in-feed antibiotics like BMD to enhance broiler performance especially when the birds are exposed to heavy infections on fields.
基金supported by the National Key Research and Development Program of China(2019YFD0900201)by the National Research Council of Italy(CNR)in the contest of the bilateral project(CNR Prot.n.0082796/2020)between CNRthe Ministry of Science and Technology of the People’s Republic of China(MOST).
文摘Modern aquaculture must be sustainable in terms of energy consumption, raw materials used, and environmental impact, so alternatives are needed to replace fish feed with other raw materials. Enzyme use in the agri-food industry is based on their efficiency, safety, and protection of the environment, which aligns with the requirements of a resource-saving production system. Enzyme supplementation in fish feed can improve digestibility and absorption of both plant- and animal-derived ingredients, increasing the growth parameters of aquacultural animals. Herein we summarized the recent literature that reported the use of digestive enzymes (amylases, lipases, proteases, cellulases, and hemicellulases) and non-digestive enzymes (phytases, glucose oxidase, and lysozyme) in fish feed. In addition, we analyzed how critical steps of the pelleting process, including microencapsulation and immobilization, can interfere with enzyme activity in the final fish feed product.
基金supported by the National Natural Science Foundation of China(No.21525730)the Strategic Priority Research Program of the Chinese Academy of Sciences(Nos.XDB14030401 and XDB14030402)
文摘Feed security is a prerequisite for safe animal food products.In this study,13 groups of feed and feed ingredients,totaling 2067 samples,were collected in the period of 2011 to 2014 from China.The highest mean level of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs) was found in fish meals and shell powders,with a concentration of 60.35 ng/kg,followed by mineral origin materials.In terms of the toxicity equivalent concentration,the fish oil group showed the highest PCDD/F levels because of their bio-accumulation through the aquatic food chain,with an average concentration of 1.26 ng WHO-TEQ/kg,while the lowest level was observed in compound feed for chickens and pigs,with an average value of0.16 ng WHO-TEQ/kg.OCDD and OCDF were the predominant congeners in all groups except fish oils,in which the primary congeners were 2,3,4,7,8-PeCDF and 2,3,7,8-TCDF.For zinc chloride samples,different from other zinc-based compound samples,the main congeners were 1,2,3,4,6,7,8-HpCDF(17%),1,2,3,4,7,8,9-HpCDF(15%),1,2,3,4,7,8-HxCDF(12%) and OCDF(30%).Considering toxicity equivalency factors,the dominant congeners were 2,3,4,7,8-PeCDF,1,2,3,4,7,8-HxCDF,2,3,7,8-TCDF and 1,2,3,7,8-PeCDD,and the contribution to the total TEQwas29%,16%,14%and 12%,respectively.Overall,2.1%(43 out of 2067) of all the analyzed samples exceeded the different individual 'European Union maximum limited levels for PCDD/Fs.This study is beneficial for the determination of the status of contamination levels of feed and feed ingredients.
基金The authors thank Jana Zeleňáková(RIAP Nitra)for meat quality analysis.Special thanks also go to Research Institute for the Biology of Farm Animals,Dummerstorf,Germany,for antioxidant stability analysis.
文摘Forty-two (42) finishing pigs (entire males—EM, surgical castrates—SC and gilts—G, each of 14)—progeny of Landracesows and Hampshire × Pietrain boars, were included in the trial. They were randomly divided into control and experimental groups(each of seven). Control groups were fed the standard diet without any supplement. Experimental groups received standard diet withthe same composition as control but with supplement of creatine monohydrate (CMH, 2.0 g/kg of feed) for 30 d prior to slaughter.Sex of pigs had significant effect (p < 0.05) on drip loss and tenderness of pork when EM showed higher drip loss than SC and lowertenderness compared to other two groups (4.71% vs. 3.80%, resp. 3.23 vs. 3.91 and 4.12). Creatine level in plasma was increased byCMH supplementation in 46% in EM, 43% in SC and 41% in G. Similarly, concentration of phosphocreatine (PCr) in muscleincreased in 84% in EM, 88% in SC and 83% in G, respectively. CMH also improved meat colour L* (50.03 vs. 48.88) and reduceddrip loss in both EM (5.24% vs. 4.18%) and G (4.48% vs. 3.60%). Higher tenderness and better oxidative stability of pork after CMHsupplementation was found in all three sexes.
基金Supported by National Natural Science Foundation of China(41263006,2014BAC04B00,21567010)Program of Jiangxi Provincial Department of Science and Technology(20124ACB01200,20122BBG70086)Program of Jiangxi Academy of Sciences(JAS(2013)No.19-06,2016-YCXY-04,2013-XTPH1-14,2013H003)
文摘With the rapid development of large-scale pig breeding,the problem of environmental pollution around pig farms has become increasingly serious,of which copper pollution has become particularly prominent. Plants such as Leerisia Orygides L.,Eichhornia crassipes( Mart.) Solms,Commelina communis L.,and Rumex acetosa L. that have strong ability to absorb and transform copper can be used to build constructed wetlands to absorb copper in pig waste,and it can be used as a feed additive to be recycled,which can prevent a larger range of pollution caused by the migration and diffusion of copper.
文摘<span style="font-family:Verdana;">In order to contribute to the improvement of the knowledge on the</span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;"> valorization of biochar as a feed additive in livestock, three biochar made from cassava peelings, bean tops and cocoa pods were manufactured. After analyzing their mineral composition, they were incorporated into rations at a rate of 0.8% in order to evaluate their effects on the performance of reproduction and pre-weaning growth in cavy (</span><i><i><span style="font-family:Verdana;">Cavia</span></i><span> <i><span style="font-family:Verdana;">porcellus</span></i><span style="font-family:Verdana;"></span></span></i></span></span><span style="font-family:Verdana;">). The trials were conducted in the Research Unit of Animal Production and Nutrition (URPRONAN) of the University of Dschang, on 96 adult local breed cavy (from the first generation), including 80 females and 16 males aged 4 months and with an average weight of 400 ± 0.25 g. After 2 weeks of adaptation in the rearing boxes at the farm, the females were put in reproduction for a period of 31 days, the animals were divided into 04 batches of 20 females and 4 males. The animals in the control lot were fed a compound feed without biochar (T) while the oth</span><span style="font-family:Verdana;">ers were fed the compound feed containing 0.8% of cassava peel biochar</span><span style="font-family:Verdana;"> (EM), 0.8% of bean tops biochar (FH) and 0.8% of cocoa pod husks biochar (CC) respectively. The results of this study showed that the ash content (26%) and macro-element concentration were higher in the bean husk charcoal compared to the other charcoals and the trace elements were more concentrated in the cassava peel charcoal. The best fertility rate (87.5%) was obtained in </span><span style="font-family:Verdana;">animals receiving the ration containing organic cocoa pod charcoal. The</span><span style="font-family:Verdana;"> highest abortion rate (63.16%) was obtained in the batch of animals receiving the </span><span style="font-family:Verdana;">ration containing organic bean husk charcoal. Pre-weaning mortality rates </span><span style="font-family:Verdana;">were comparable between the different rations. Piglet weights at birth were comparable between the different rations. At weaning, the highest average weight of the kids was recorded with the ration containing the organic bean charcoal (197.25 ± 46.9 g). The highest ADG (4.82 ± 0.74 g/d) and TG (101.25 g) were recorded in the batch of animals receiving the FH ration. Thus, the incorporation of 0.8% of the powder of organic coals seems to have adverse effects on reproductive performance. On the other hand, these coals significantly improve the pre-weaning growth performance in cavy.</span></span>