Finish Effect of Different Feeding Patterns on Weaned Lamb

Finish effect of four feeding patterns on weaned lamb was studied in the paper. The results showed that the performance of growing lambs by agricultural byproduct residual forage was superior to other feeding methods; too high proportion of straw in diet was unfavorable for finish lamb, and corn straw should be combined with complete feed to get better feeding effect.

Light demand characteristics,production performance,and changes in the feeding patterns of broilers

Poultry is a light-sensitive animal and the light environment has an important influence on the growth and development of these animals.Previous studies have mainly focused on the effects of the light environment on various physiological indicators of poultry but seldom explored the light demand characteristics of broilers under free selection.This experiment mainly studied the light demand characteristics of broilers under a yellow LED light environment and the influence of different breeding densities[low-density(2.5 broilers/m^(2)),high-density(7.5 broilers/m^(2))]on the production performance and diet characteristics of broilers.Studies showed that the production performance indexes of low-density groups are higher than those of high-density groups.The feed and water consumption in the light area of the two experimental groups were significantly higher than those in the dark area,which means that the broilers showed a great preference for the light area.However,as the age of the broilers increased,the food and water consumption of the broilers decreased,indicating that broilers had a lower preference for light in the middle and late stages of growth.The statistical results for the residence frequency distribution characteristics showed that broiler chickens had different light requirements at different growth stages under the condition of active selection:1)low-density breeding environment:23.8L(light):0.2D(dark)for chicks and 22.3L:1.7D for adult broilers;2)high-density breeding environment:22.6L:1.4D for chicks and 15.0L:9.0D for adult broilers.This study will provide a reference for the optimization and control of light environment in broiler breeding.

Effects of a two-meal daily feeding pattern with varied crude protein levels on growth performance and antioxidant indexes in pigs

The present study aimed to evaluate the effects of daily feeding pattern on growth performance, blood biochemistry, and antioxidant indexes in pigs. One hundred and eighty female Duroc x Landrace x Yorkshire(DLY) pigs with similar body weight(11.00 ± 0.12 kg) were randomly assigned to 3 groups: the control group(fed 17.01% CP diet, twice daily); high-low group(H-L group, fed18.33% CP diet in the morning, followed by 15.70% CP diet in the afternoon); and low-high group(L-H group, fed 15.70% CP diet in the morning, followed by 18.33% CP diet in the afternoon)(n = 6). Comparable amounts of their respective diets were given at 05:30 and 15:00 throughout the experimental periods to make all the treatments consumed the same type of food and the same amount of calories on a daily basis. On day 30, one pig was randomly selected per litter for blood samples. Compared with the control group, ADG in the H-L and L-H groups increased by 8.11% and 16.23%, but not significant(P > 0.05); and blood urea nitrogen(BUN) in the H-L and L-H groups decreased by 26.76% and 41.04%(P < 0.05), respectively. The H-L group feeding pattern could significantly improve levels of serum superoxide dismutase(SOD), when compared with the control group. These findings suggest that the twomeal daily feeding pattern with varied levels of CP affects serum levels of BUN and SOD. These changes could effectively silightly improve growth performance and antioxidant capacity in pigs without incurring increased feeding costs.

Rumen microbial-driven metabolite from grazing lambs potentially regulates body fatty acid metabolism by lipid-related genes in liver

Background Lipid metabolism differs significantly between grazing and stall-feeding lambs,affecting the quality of livestock products.As two critical organs of lipid metabolism,the differences between feeding patterns on rumen and liver metabolism remain unclear.In this study,16S rRNA,metagenomics,transcriptomics,and untargeted metabolomics were utilized to investigate the key rumen microorganisms and metabolites,as well as liver genes and metabolites associated with fatty acid metabolism under indoor feeding(F)and grazing(G).Results Compared with grazing,indoor feeding increased ruminal propionate content.Using metagenome sequencing in combination with 16S rRNA amplicon sequencing,the results showed that the abundance of propionate-producing Succiniclasticum and hydrogenating bacteria Tenericutes was enriched in the F group.For rumen metabolism,grazing caused up-regulation of EPA,DHA and oleic acid and down-regulation of decanoic acid,as well as,screening for 2-ketobutyric acid as a vital differential metabolite,which was enriched in the propionate metabolism pathway.In the liver,indoor feeding increased 3-hydroxypropanoate and citric acid content,causing changes in propionate metabolism and citrate cycle,while decreasing the ETA content.Then,the liver transcriptome revealed that 11 lipid-related genes were differentially expressed in the two feeding patterns.Correlation analysis showed that the expression of CYP4A6,FADS1,FADS2,ALDH6A1 and CYP2C23 was significantly associated with the propionate metabolism process,suggesting that propionate metabolism may be an important factor mediating the hepatic lipid metabolism.Besides,the unsaturated fatty acids in muscle,rumen and liver also had a close correlation.Conclusions Overall,our data demonstrated that rumen microbial-driven metabolite from grazing lambs potentially regulates multiple hepatic lipid-related genes,ultimately affecting body fatty acid metabolism.

瘦内型品种与雅南猪的二元、三元杂交效果的研究

长白猪×雅南猪（Ｌ．Ｙａ）、汉普夏×雅南猪（Ｈ．Ｙａ）、杜洛克×雅南猪（Ｄ．Ｙａ）、大白猪×雅南猪（Ｗ．Ｙａ）、长白猪×（杜洛克×雅南猪）（Ｌ．ＤＹａ）、汉普夏×（杜洛克×雅南（Ｈ．Ｄｙａ）和大白猪×（杜洛克×雅南猪）（Ｗ．Ｄｙａ）７个杂交组合共１９６头试猪，在前期（２０－５０千克）饲喂低能（２．８兆卡／千克）高蛋白（１７－１８％）、后期（５０－９０千克）低能（２．８兆卡／千克）低蛋白（１２－１３％）饲粮，前敞后限条件下，Ｌ．Ｙａ、Ｈ．Ｙａ、Ｄ．Ｙａ、Ｌ．ＤＹａ和Ｈ．ＤＹａ是较优的５个杂交组合，平均日增重分别为５７９克、５９２克、５８１克、５９７克和５７３克，每千克增重耗料分别为３．７１、３．５６、３．６８、３．５０和３．２８（千克），胴体瘦肉率分别是５３．８、５３．３、５４．３、５６．８和５７．５（％）。平均日增重分别比相应的对照组低４．８、８．８、２．２、１．４和１０．１（％），胴体瘦肉率分别比相应对照组增加２．８、１．０、１．５１．１和０．８个百分点。Ｗ．Ｙａ和Ｗ．Ｄｙａ表现出较上述杂交组合积脂力更强的特点，瘦肉率试验组分别为５２．４％和５４．０％，对照组分别为４９．１％和５２．５％，各组合的各项肉质?