日粮添加益生菌对樱桃谷肉鸭生长性能、免疫功能及肠道健康的影响OA

To investigate the effects of dietary probiotic supplementation on growth performance,immune function,and intestinal health of Cherry Valley meat ducks.A total of 500 healthy 1-day-old Cherry Valley meat ducks were selected and randomly divided into 5 groups,with 5 replicates,20 Cherry Valley meat ducks per replicate.The control group was fed basal diet(formulated for two stages:1～21 days and 22～42 days according to nutritional requirements),while the 4 experimental groups were fed basal diet+500 mg/kg,1000 mg/kg,1500 mg/kg,and 2000 mg/kg of probiotics.The experimental period lasted for 42 days.Results:(1)Compared with control group,1500 mg/kg and 2000 mg/kg experimental groups exhibited significantly increased ADG during 22～42 days and 1～42 days(P＜0.05),and significantly decreased FCR during 22～42 days(P＜0.05).No significant differences were observed in growth performance indicators between 1500 mg/kg and 2000 mg/kg experimental groups(P＞0.05).(2)Compared with control group,1000 mg/kg,1500 mg/kg,and 2000 mg/kg experimental groups showed significantly increased serum IgG content and bursa of Fabricius index(P＜0.05).The spleen index of 4 experimental groups was significantly higher than control group(P＜0.05).(3)Duodenal villus height and villus height-to-crypt depth ratio of 4 experimental groups were significantly higher than control group(P＜0.05).Ileal crypt depth of control group and 500 mg/kg experimental group was significantly higher than 2000 mg/kg experimental group(P＜0.05),while the villus height-to-crypt depth ratio was significantly lower than 2000 mg/kg experimental group(P＜0.05).In conclusion,dietary probiotic supplementation can enhance growth performance,immune function,and improve intestinal health in Cherry Valley meat ducks.Under the conditions of this experiment,the recommended supplemental level of probiotics is 1500 mg/kg to 2000 mg/kg.