Wang Y.,Twins Group Co. |
Zhang Y.,Observation and Experiment Station of Animal Nutrition |
Zhang Y.,CAS Institute of Subtropical Agriculture |
Feng Z.,Observation and Experiment Station of Animal Nutrition |
And 5 more authors.
Journal of Food, Agriculture and Environment | Year: 2012
Accurate determination of the dietary proteins and amino acid requirements of swine is essential to improve growth and reduce production costs and nitrogen excretion in the environment. The paper reviewed the measurement of N and amino acid availability, including the conception of the standardized ileal digestibility (SID) of amino acids and ileal protein, and the measuring techniques of quantify endogenous nitrogen flow at the distal ileum of the pig. In addition, the impact of some factors, such as dietary fibre, exogenous enzymes, environment and carbohydrate supply, on ileal digestibility and utilization of N and amino acids, is discussed.
Xiong X.,Observation and Experiment Station of Animal Nutrition |
Yang H.,Observation and Experiment Station of Animal Nutrition |
Li B.,Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production |
Liu G.,Observation and Experiment Station of Animal Nutrition |
And 6 more authors.
Livestock Science | Year: 2015
Weaning is associated with impairments in intestinal and immune function, and dietary supplementation with yeast products can improve the intestine mucosal structure and stimulate the immune system of weaned piglets. The present study was conducted to test the hypothesis that dietary supplementation with yeast product may regulate immunoglobulin production by improving intestinal function and nutrient levels in weaned piglets. Eighteen piglets weaned at 21 days of age were randomly assigned to receive 1 of 3 treatments consisting of a basal diet (control), the basal diet supplemented with 1.2. g/kg of yeast product (yeast product) or the basal diet supplemented with 20. mg/kg of colistin sulphate (antibiotic) for 14 days. Dietary yeast product or antibiotic supplementation enhanced (. P<0.05) duodenal and ileal mucosal sIgA as well as serum total protein, IgG, and IgM contents in weaned piglets. Piglets that were fed a diet that contained yeast product had greater (. P<0.05) serum Ile, Leu, Phe, and Pro contents than control piglets. The contents of Arg, His, Leu, Lys, Trp, Val, Ser, Glu, Gln, and Pro in the ileal mucosa of weaned piglets were also increased (. P<0.05) when yeast products were included in the diet. Consistent with the increases in amino acid (AA) contents, the activity of alkaline phosphatase and the expression of AA transporters were both increased (. P<0.05) in the ileum of piglets that were fed a diet that contained yeast product. These findings indicate that yeast product may enhance immunoglobulin production by improving intestinal function and the levels of nutrients in weaned piglets, which suggests that yeast product might be an alternative to the use of antibiotics in diets for weaning piglets. © 2014.