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Articles by Y.P. Xiao
Total Records ( 2 ) for Y.P. Xiao
  Y.P. Xiao , X.Y. Li , T.X. Wu , L. Yang , Q.H. Hong , C.M. Yang and A.G. Chen
  Glutamine has an essential role with a beneficial function in improving the nutrition status of young mammals. The influence of L-Glutamine (Gln) on the Coefficient of Total Tract Apparent Digestibility (CTTAD) and Apparent Ileal Digestibility (AID), the jejunal enzyme activity associated with nutrient absorption and the energy production in weaned piglets has not been sufficiently studied. The aim of the present study is to provide a profile of the effects of Gln on CTTAD, AID, the activities of jejunal enzymes in connection with nutrient digestion and absorption and energy production. The piglets were weaned at 21 days of age. There were two groups in Experiment 1 and 2 representing supplementation with 0 or 1% Gln to the basal diet. In Experiment 1, the CTTAD of the dietary components and energy was assessed at 3, 5, 10, 15 and 30 days after weaning. In Experiment 2, productive performance, AID, jejunal enzyme activities and expression of Peroxisome Proliferator-Activated Receptor gamma (PPARγ) were measured at 10 and 30 days post-weaning. Results showed that dietary Gln supplementation significantly improved the CTTAD of DM, OM, GE and AA and the CTTAD increased significantly with the extension of days after weaning. For the entire experiment, the average daily gain increased by 12.40% (p = 0.049) in the Gln group. Dietary Gln supplementation increased the AID of GE, Leu, Lys, Cys and Pro by 12.50 (p = 0.047), 7.03% (p = 0.041), 5.95% (p = 0.036), 9.30 (p = 0.025), 11.17% (p = 0.009), respectively at 10 days post-weaning; Pro by 6.11% (p = 0.044) at 30 days post-weaning. Jejunal brush border membrane-bound alkaline phosphatase activity increased in the Gln-supplemented pigs by 30.36% (p = 0.048) and 6.21% (p = 0.30) at 10 and 30 days post-weaning, respectively. Compared with the control pigs, the mRNA level of PPARγ decreased by 10.85% (p = 0.14) and 41.88% (p = 0.023) after the administration of 1% Gln for 10 and 30 days, respectively. The activity of glutamine synthetase decreased by 48.89% (p = 0.044) at 10 days post-weaning and pyruvate kinase by 13.13% (p = 0.036) at 30 days post-weaning in the Gln-supplemented pigs. In conclusion, 1% Gln supplementation to the post-weaned piglet diet enhanced the CTTAD and AID of diet, improved intestinal absorption and modified jejunal enzyme activities related to Gln metabolism and energy production.
  G.T. Cao , Y.P. Xiao , C.M. Yang , A.G. Chen , T.T. Liu , L. Zhou , L. Zhang and P.R. Ferket
  A total of 600, 1 day old male Lingnan Yellow broiler chickens were used to investigate the effects of Clostridium butyricum (C. butyricum) on growth performance, nitrogen metabolism, intestinal morphology and cecal microflora in broiler chickens. The birds were randomly assigned into 5 treatments (6 replicate pens per treatment with 20 birds per pen) and fed the same antibiotic-free basal diets during a 42 days feeding experiment. The treatments were as follows: no addition (Control), 2.5x107 cfu C. butyricum kg-1 of diet (CB1), 5x107 cfu C. butyricum kg-1 of diet (CB2), 1x108 cfu C. butyricum kg-1 of diet (CB3) and 10 mg colistine sulfate kg-1 of diet (Antibiotic). Compared with the control birds, birds fed either CB1 or CB2 or antibiotic diet had greater (p<0.05) Body Weight (BW) on day 21 and 42 and higher (p<0.05) Average Daily Gain (ADG) from day 1-42. Birds fed C. butyricum or antibiotic diet had lower (p<0.05) Feed-to-Gain ratio (F:G) than the control birds from day 1-42. Dietary C. butyricum decreased (p<0.05) the concentration of serum Uric Acid (UA) compared with the control diet on day 21. Supplementation with CB2 or CB3 decreased (p<0.05) serum ammonia concentration compared with the control diet on day 21 and 42. Birds fed C. butyricum diet had higher (p<0.05) ileal villus height than the control birds on day 21 and 42. Birds fed CB2 or CB3 diet had lower (p<0.05) ileal crypt depth than the control birds on day 21 and 42. Supplementation with CB1 or CB3 decreased (p<0.05) the population of cecal Escherichia coli (E. coli) compared with the control on day 21. Birds fed C. butyricum diet had higher (p<0.05) population of cecal Bifidobacterium on day 21 and birds fed CB2 diet had higher (p<0.05) cecal Bifidobacterium on day 42 compared with the control birds. Supplementation with CB1 or CB2 increased (p<0.05) the number of cecal Lactobacillus on day 21 and supplementation with CB2 increased (p<0.05) Lactobacillus on day 42 compared with the control or antibiotic groups. The results indicate that supplementation with C. butyricum promotes growth performance, modulates nitrogen metabolism improves intestinal morphology and balances cecal microflora in broiler chickens.
 
 
 
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