| The experiment was conducted to evaluate the effects of yeast culture on immune function and antioxidant indices of
broilers. Two hundred and forty one-day-old AA chickens were randomly divided into 6 groups with 4 replicates in each group and 10 chickens per replicate. The chickens in the control group (group Ⅰ) were only fed a basal diet ,and groups Ⅰ，Ⅱ，Ⅲ，Ⅳ，Ⅴ and Ⅵ were yeast culture groups, supplemented with 0.05%,0.10%,0.15%,0.20% and 0.25% yeast culture, respectively. The experiment lasted for 21 days.The results showed as follows: compared with the control group, the spleen index , the thymus index and the bursa of Fabricius index were increased by 61.45%(P<0.01), 23.05%and 49.25%(P<0.05); the anti-NDV titers in group Ⅴ were increased significantly(P<0.05). The serum total anti-oxidation capability (T-AOC) activity in groups Ⅲ，Ⅳ，Ⅴ were higher than those in the control group(P<0.05), higher above 56.44%, 61.96% and 69.33%, respectively; the serum total superoxide dismutase(T-SOD) activity in group Ⅴ was enhanced while the serum malondialdehyd (MDA) content was decreased significantly. Yeast culture had significant effects on the serum total protein,serum cholesterol, serum triglyceride and serum uric acid, but no effect on the serum glucose.In conclusion, supplementation of yeast culture can enhance immune function, meanwhile increase antioxidant indices and better serum biochemical parameter of broilers. Under the experimental condition, the appropriate supplementation amount of yeast culture was 0.20%. |
