摘要
Abstract
This experiment was conducted to evaluate the effects of astragalus extract(AE)on growth performance,antioxidant capacity,and intestinal microbiota of broilers.A total of three hundred 1-day-old white-feathered broilers were randomly assigned to a control group and four treatment groups,each consisting of 4 replicates of 15 birds each.The 5 groups were fed diets supplemented with 0％(control group),0.05％,0.1％,0.15％,and,0.2％of AE,respectively.The experiment lasted for 42d.Results showed that:(1)Compared with control group,0.15％and 0.2％AE groups had significantly higher body weight at 42 d and ADG during periods d22～d42 and d1～d42,and significantly lower F/G in phase d22～d42(P<0.05).No significant differences in growth performance parameters were observed between 0.15％and 0.2％groups(P>0.05).(2)Hepatic T-AOC activity in 0.1％,0.15％,and 0.2％groups was significantly higher and MDA content was significantly lower than control group(P<0.05).SOD activity in 0.15％and 0.2％groups was significantly higher than control group(P<0.05).(3)The Lactobacillus count in cecal content of 0.1％,0.15％,and 0.2％groups was significantly higher than the control group(P<0.05).Compared with control and 0.05％groups,0.15％and 0.2％groups showed significant increase in Bifidobacterium count and significant decrease in Escherichia coli count in cecal content(P<0.05).In conclusion,AE can improve growth performance,enhance liver antioxidant capacity,and modulate the intestinal microbiota of broilers.The recommended supplemental level of AE in broilers'diet is 0.15％.关键词
黄芪提取物/肉鸡/生长性能/抗氧化能力/肠道菌群Key words
astragalus extract/broilers/growth performance/antioxidant capacity/intestinal microbiota分类
农业科技
