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Articles by Z. B. Yang
Total Records ( 2 ) for Z. B. Yang
  H. F. Wang , W. R. Yang , H. W. Yang , Y. Wang , Z. B. Yang , S. Z. Jiang and G. G. Zhang
  An experiment was conducted using 720 one-day-old Arbor Acres broiler chickens to evaluate the effects of Astragalus membranaceus root powder (AMP), Astragalus polysaccharides (APS) on growth performance, carcass characteristics, and antioxidant enzymes, and metabolites of blood and liver in broiler chickens. The six dietary treatments included a control that was a corn-soybean meal basal diet; basal diet supplemented with 120 mg/kg antibiotic; 350 mg/kg APS; or 5000, 10,000, or 15,000 mg/kg diet of AMP. Supplementation of 10,000 mg/kg AMP increased average daily gain and feed conversion rate of broilers in grower period (22-42 d) and over the entire experiment compared to basic diet. Responses of antioxidant status to dietary APS and AMP varied depending on the age of the broilers. Beneficial effects of AMP on growth and feed utilization of broilers could be obtained by inclusion of AMP at the rate of 10,000 mg/kg diet.
  W. R. Yang , H. Sun , Q. Y. Wang , F. X. Liu and Z. B. Yang
  Problem statement: Free Met as one of the most limiting AA in dairy cows would be mostly degraded in the rumen. This study was to determine the effect of different levels of Rumen-Protected Met (RPMet) on dairy performance and serum amino acid metabolism. Approach: Thirty-six Holstein cows in similar condition were randomly assigned to six experimental treatments with six replicates each. Levels of RPMet in six treatments were 0(control), 14, 28, 42, 56 and 70 g day-1 per cow, respectively. Results: Treatment had no effect on percentage of milk protein, lactose and SNF. However, milk yield of cows fed 42 g day-1 RPMet was significantly higher than that of the control group and milk fat percentage was significantly increased with 56 g day-1 RPMet supplementation. There was the trend to decrease the concentration of serum amino acids except Met and Arg with the supplementation of RPMet. Serum EAA contents of the group supplementation of 42 g day-1 RPMet were lowest although there were no significant differences among all treatments. Serum BCAA concentrations of cows fed 28 g RPMet were significantly lower than that of the control group. Supplementation of 42 g RPMet could significantly decrease the concentration of NEAA and TAA compared to the control group. Conclusion/Recommendations: Supplementation of rumen-protected methionine improved dairy performance and promoted amino acid utilization in lactating cows in the present experiment. The optimal level of RPMet in the diet was 42 g per cow day-1.
 
 
 
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