富硒啤酒酵母对肉鸡生长性能及抗氧化能力的影响

60羽1周龄的健康AA肉鸡，随机均分为5组，每组12羽：1组为对照组，饲喂含亚硒酸钠0.152 mg?kg-1的基础日粮；2-4组为富硒啤酒酵母组，分别在基础日粮中添加有机硒的水平为0.2、0.5和1.0 mg?kg-1；5组为啤酒酵母组，在基础日粮中添加啤酒酵母。分别在试验的第14、21和28 d分测定鸡的体重，并取全血谷胱甘肽过氧化物酶(GSH-Px)活性、血浆超氧化物歧化酶(SOD) 活性和血浆总抗氧化能力（T-AOC）。结果表明，在试验的第14、21 d，各组鸡的体重之间差异不显著（P>0.05），在28 d时，2-3组显著高于1组（P<0.05）；2-4组鸡全血GSH-PX活性、SOD活性和T-AOC均显著或极显著高于1组和5组（P<0.05或 P<0.01）。因此，富硒啤酒酵母能明显提高鸡的抗氧化能力，是一种较好的有机硒源。

Effect of Selenium-enriched Beer Yeast on the Growth Performance and the Antioxidant Capacity in Broiler

A total of sixty broilers aged 1 day were randomly divided into five groups. The first group was control group fed with basal diet, the second, third and forth were the experimental groups fed with diets containing 0.2, 0.5, and 1.0 mg?kg-1 selenium by supplying the selenium-enriched beer yeast, the fifth group fed with diets containing beer yeast. The body weight, the whole-blood glutathione pereoxidase (GSH-Px) activity, plasma superoxide dismutase (SOD) activity and total oxidation capacity (T-AOC) value were detected on days 14 and 28. The results showed that body weight of these groups was not different on days 14 and 21, but on days 28, there was a significant difference between the 2nd, 3rd group and the 1st group. The whole-blood GSH-Px activity, plasma SOD activity and T-AOC value in the experimental groups were significantly or more significantly higher than those of the 1st and 5th group. It is concluded that the selenium-enriched beer yeast, which could increase the activity of GSH-Px and SOD, T-AOC value, is a better source of Se for broiler.