Background:This study aimed to develop a combined model to quantify the net absorption of volatile fatty acids(VFA)in the large intestine(LI)of pigs.Methods:Fifteen female growing pigs(Duroc×Large White×Land...Background:This study aimed to develop a combined model to quantify the net absorption of volatile fatty acids(VFA)in the large intestine(LI)of pigs.Methods:Fifteen female growing pigs(Duroc×Large White×Landrace)were ranked by body weight(30±2.1 kg)on day 0 and assigned to one of three treatments,namely the basal diet containing different crude fiber(CF)levels(LCF:3.0%CF,MCF:4.5%CF,and HCF:6.0%CF).The pigs were implanted with the terminal ileum fistula and the cannulation of the ileal mesenteric vein(IMV),portal vein(PV),and left femoral artery(LFA)from days 6 to 7.[13 C]-Labeled VFA and P-aminohippuric acid were constantly perfused into the terminal ileum fistula and the cannulation of the IMV(day 15),respectively.Blood samples were collected from the PV and the LFA during perfusion(5 h),and LI samples were collected.Results:The net flux of[12 C]-acetic acid in the PV was greater for LCF versus MCF(p=0.045),but no difference was observed in the net flux of[12 C]-propionic acid(p=0.505)and[12 C]-butyric acid(p=0.35)in the PV among treatments.The deposition of[12 C]-acetic acid in the LI was greater for LCF versus MCF(p=0.014),whereas the deposition of[12 C]-propionic acid(p=0.007)and[12 C]-butyric acid(p=0.037)in the LI was greater for LCF versus HCF.Conclusions:In conclusion,this pig model was found conducive to study the net absorption of VFAs in the LI,and LCF had more net absorption of VFAs in the LI than MCF and HCF.展开更多
[Objective] The study was carried out to investigate the effects of dietary crude fiber on growth performance and serum biochemical in-dex of Dingan geese aged from 35 to 70 days.[Method] A total of 120 Dingan geese o...[Objective] The study was carried out to investigate the effects of dietary crude fiber on growth performance and serum biochemical in-dex of Dingan geese aged from 35 to 70 days.[Method] A total of 120 Dingan geese on day 28 with the same genetic background and similar initial weight(1 384.83.73±0.76 g) were randomly assigned into 3 groups, with 4 replicates per group and 10 geese per replicate. Geese were fed the diets containing 4.29%, 5.29% and 6.29 % crude fiber, respectively. The experiment lasted 35 d.[Result] Final weight and daily gain of 5.29 %CF group were significantly higher than those of 6.29 % CF group(P<0.05);Feed intake was markedly higher than those of 4.29% and 6.29 % CF groups(P<0.05);Feed gain ratio was significantly lower than that of 6.29 % CF group(P<0.05). Compared with 4.29% and 6.29 % CF groups, serum albumin concentrations of 5.29 % CF group increased significantly(P<0.05), while serum total protein and globin contents were higher(P>0.05), but serum uric acid level was lower(P>0.05).[Conclusion] 5.29 % crude fiber could lead to higher growth performance of Dingan geese.展开更多
[Objective]The paper was to investigate the effects of dietary crude fiber level on production performance,organ index and serum biochemical parameters of Dingan geese aged from 1 to 28 days.[Method]A total of 144 1-d...[Objective]The paper was to investigate the effects of dietary crude fiber level on production performance,organ index and serum biochemical parameters of Dingan geese aged from 1 to 28 days.[Method]A total of 144 1-day-old Dingan geese with the same genetic background and similar initial weight(88.75±0.21g)were randomly assigned into 3 groups with 4 replicates per group and 12 geese per replicate,and fed with the diets containing 2.56%,3.52% and 4.48% crude fiber,respectively.The trial lasted 28 d.[Result]1)The final weight and daily gain of 3.52% CF group were significantly higher than those of 2.56% CF group(P<0.05);the feed/gain ratio was markedly lower than that of 2.56% CF group(P<0.05).2)The slaughter rate,semi-eviscerated rate and leg muscle rate of 3.52% CF group were higher than those of 2.56% and 4.48% CF groups(P>0.05).3)As the dietary crude fiber levels rose,the abdominal fat rate showed a downward trend(P>0.05).4)The liver index of 3.52% CF group was significantly higher than that of 2.56% CF group(P<0.05).4)Compared with 2.5%and 4.48% CF groups,the serum albumin concentrations of 3.52% CF group markedly increased(P<0.05),the serum total protein and globin contents were higher(P>0.05),but the serum uric acid level was lower(P>0.05).[Conclusion]When the crude fiber level was 3.52%,the production performances of Dingan geese aged from 1 to 28 days were better,and the liver index and serum albumin level could be obviously improved.展开更多
Thermal remediation of the soil contaminated with crude oil using microwave heating enhanced by carbon fiber(CF) was explored. The contaminated soil was treated with 2.45 GHz microwave,and CF was added to improve the ...Thermal remediation of the soil contaminated with crude oil using microwave heating enhanced by carbon fiber(CF) was explored. The contaminated soil was treated with 2.45 GHz microwave,and CF was added to improve the conversion of microwave energy into thermal energy to heat the soil.During microwave heating,the oil contaminant was removed from the soil matrix and recovered by a condensation system of ice-salt bath.The experimental results indicated that CF could effciently enhance the microwave heating of soil even with relatively low-dose.With 0.1 wt.%CF,the soil could be heated to approximately 700°C within 4 min using 800 W of microwave irradiation.Correspondingly,the contaminated soil could be highly cleaned up in a short time.Investigation of oil recovery showed that,during the remediation process,oil contaminant in the soil could be effciently recovered without causing significant secondary pollution.展开更多
[Objective] The paper was to study the effects of different levels of NaOH on fiber, crude protein and soluble sugar content of corn straw. [Method] Four treatments were designed in the test, namely control group, gro...[Objective] The paper was to study the effects of different levels of NaOH on fiber, crude protein and soluble sugar content of corn straw. [Method] Four treatments were designed in the test, namely control group, group 1, group 2 and group 3, which were added with 0, 2%, 3%and 4% NaOH according to the dry weight of corn straw, and the moisture of corn straw after treatment was 45%. After being treated at room tem-perature for 48 h, sensory evaluation and nutrient composition analysis were performed for each group, and the contents of neutral detergent fiber(NDF), acid detergent fiber(ADF), crude protein(CP) and soluble sugar(SS) were measured. [Result] With the increasing addition level of NaOH,the content of NDF and ADF decreased gradually, and significant differences were observed between group 3(adding 4% NaOH) and control group(P<0.05). There was no significant difference in CP content among treatment groups(P>0.05); the SS content gradually increased, and there were significant differences between treatment groups and control group(P<0.05). [Conclusion] 4% NaOH reduced the fiber content and increased the soluble sugar content of corn straw.展开更多
基金National Natural Science Foundation of China,Grant/Award Number:31201833 and 31872373Open Project of Hubei Key Laboratory of Animal Nutrition and Feed Science,Grant/Award Number:202306Scientific Research Plan Guiding Project of Hubei Provincial Education Department,Grant/Award Number:B2018082。
文摘Background:This study aimed to develop a combined model to quantify the net absorption of volatile fatty acids(VFA)in the large intestine(LI)of pigs.Methods:Fifteen female growing pigs(Duroc×Large White×Landrace)were ranked by body weight(30±2.1 kg)on day 0 and assigned to one of three treatments,namely the basal diet containing different crude fiber(CF)levels(LCF:3.0%CF,MCF:4.5%CF,and HCF:6.0%CF).The pigs were implanted with the terminal ileum fistula and the cannulation of the ileal mesenteric vein(IMV),portal vein(PV),and left femoral artery(LFA)from days 6 to 7.[13 C]-Labeled VFA and P-aminohippuric acid were constantly perfused into the terminal ileum fistula and the cannulation of the IMV(day 15),respectively.Blood samples were collected from the PV and the LFA during perfusion(5 h),and LI samples were collected.Results:The net flux of[12 C]-acetic acid in the PV was greater for LCF versus MCF(p=0.045),but no difference was observed in the net flux of[12 C]-propionic acid(p=0.505)and[12 C]-butyric acid(p=0.35)in the PV among treatments.The deposition of[12 C]-acetic acid in the LI was greater for LCF versus MCF(p=0.014),whereas the deposition of[12 C]-propionic acid(p=0.007)and[12 C]-butyric acid(p=0.037)in the LI was greater for LCF versus HCF.Conclusions:In conclusion,this pig model was found conducive to study the net absorption of VFAs in the LI,and LCF had more net absorption of VFAs in the LI than MCF and HCF.
基金Special Project for Technical Development of Hainan Scientific Research Institutions(SQ2017JSKF0008)China Agricultural Industry Research System(CARS-43-42)
文摘[Objective] The study was carried out to investigate the effects of dietary crude fiber on growth performance and serum biochemical in-dex of Dingan geese aged from 35 to 70 days.[Method] A total of 120 Dingan geese on day 28 with the same genetic background and similar initial weight(1 384.83.73±0.76 g) were randomly assigned into 3 groups, with 4 replicates per group and 10 geese per replicate. Geese were fed the diets containing 4.29%, 5.29% and 6.29 % crude fiber, respectively. The experiment lasted 35 d.[Result] Final weight and daily gain of 5.29 %CF group were significantly higher than those of 6.29 % CF group(P<0.05);Feed intake was markedly higher than those of 4.29% and 6.29 % CF groups(P<0.05);Feed gain ratio was significantly lower than that of 6.29 % CF group(P<0.05). Compared with 4.29% and 6.29 % CF groups, serum albumin concentrations of 5.29 % CF group increased significantly(P<0.05), while serum total protein and globin contents were higher(P>0.05), but serum uric acid level was lower(P>0.05).[Conclusion] 5.29 % crude fiber could lead to higher growth performance of Dingan geese.
基金Supported by Special Fund for Technology Development of Hainan Scientific Research Institute(KYYS-2019-04)Natural Science Foundation of Hainan Province(318MS109)+1 种基金Special Fund for Construction of China Agricultural Industry Research System(CARS-43-42)Special Funds for Local Science and Technology Development Guided by the Central Committee(ZY2019HN01)
文摘[Objective]The paper was to investigate the effects of dietary crude fiber level on production performance,organ index and serum biochemical parameters of Dingan geese aged from 1 to 28 days.[Method]A total of 144 1-day-old Dingan geese with the same genetic background and similar initial weight(88.75±0.21g)were randomly assigned into 3 groups with 4 replicates per group and 12 geese per replicate,and fed with the diets containing 2.56%,3.52% and 4.48% crude fiber,respectively.The trial lasted 28 d.[Result]1)The final weight and daily gain of 3.52% CF group were significantly higher than those of 2.56% CF group(P<0.05);the feed/gain ratio was markedly lower than that of 2.56% CF group(P<0.05).2)The slaughter rate,semi-eviscerated rate and leg muscle rate of 3.52% CF group were higher than those of 2.56% and 4.48% CF groups(P>0.05).3)As the dietary crude fiber levels rose,the abdominal fat rate showed a downward trend(P>0.05).4)The liver index of 3.52% CF group was significantly higher than that of 2.56% CF group(P<0.05).4)Compared with 2.5%and 4.48% CF groups,the serum albumin concentrations of 3.52% CF group markedly increased(P<0.05),the serum total protein and globin contents were higher(P>0.05),but the serum uric acid level was lower(P>0.05).[Conclusion]When the crude fiber level was 3.52%,the production performances of Dingan geese aged from 1 to 28 days were better,and the liver index and serum albumin level could be obviously improved.
基金supported by the National Basic Research Program (973) of China(No.2004CB418504)
文摘Thermal remediation of the soil contaminated with crude oil using microwave heating enhanced by carbon fiber(CF) was explored. The contaminated soil was treated with 2.45 GHz microwave,and CF was added to improve the conversion of microwave energy into thermal energy to heat the soil.During microwave heating,the oil contaminant was removed from the soil matrix and recovered by a condensation system of ice-salt bath.The experimental results indicated that CF could effciently enhance the microwave heating of soil even with relatively low-dose.With 0.1 wt.%CF,the soil could be heated to approximately 700°C within 4 min using 800 W of microwave irradiation.Correspondingly,the contaminated soil could be highly cleaned up in a short time.Investigation of oil recovery showed that,during the remediation process,oil contaminant in the soil could be effciently recovered without causing significant secondary pollution.
基金Supported by PhD Start-up Fund of Inner Mongolia University for Nationalities(BS291)
文摘[Objective] The paper was to study the effects of different levels of NaOH on fiber, crude protein and soluble sugar content of corn straw. [Method] Four treatments were designed in the test, namely control group, group 1, group 2 and group 3, which were added with 0, 2%, 3%and 4% NaOH according to the dry weight of corn straw, and the moisture of corn straw after treatment was 45%. After being treated at room tem-perature for 48 h, sensory evaluation and nutrient composition analysis were performed for each group, and the contents of neutral detergent fiber(NDF), acid detergent fiber(ADF), crude protein(CP) and soluble sugar(SS) were measured. [Result] With the increasing addition level of NaOH,the content of NDF and ADF decreased gradually, and significant differences were observed between group 3(adding 4% NaOH) and control group(P<0.05). There was no significant difference in CP content among treatment groups(P>0.05); the SS content gradually increased, and there were significant differences between treatment groups and control group(P<0.05). [Conclusion] 4% NaOH reduced the fiber content and increased the soluble sugar content of corn straw.
