The effects of composite probiotics on the growth performance,immune function,and economic benefits of broiler chickens
To investigate the effects of composite probiotics on the growth performance,immune function,and economic benefits of broilers.600 22 day old fast type yellow feathered broiler chickens with similar weight(439.52±19.23g)were selected for the experiment and randomly divided into 4 groups,with 3 replicates in each group and 50 chickens in each replicate(half male and half female).According to the Nutrient Requirements for Yellow Feather Broilers NY/T3645-2020,a basic diet was prepared,and four groups were fed with a basic diet of+0,200,400 and 600 mg/kg of composite probiotics.The experiment lasted for 40 days.The results showed that:(1)Compared with the 0 mg/kg composite probiotics group,the 400 mg/kg composite probiotics group and 600 mg/kg composite probiotics group increased the average daily weight gain of fast yellow feathered broilers by 11.32% and 10.40%,respectively(P＜0.05),and the feed to weight ratio decreased by 8.63% and 7.91%,respectively(P＜0.05).(2)Compared with the 0 mg/kg composite probiotics group,the 200 mg/kg composite probiotics group increased the serum IgA content of fast type yellow feathered broilers by 23.25% (P＜0.05);The serum IgA and IgG levels,as well as the bursal index of fast type yellow feathered broilers in the 400 mg/kg and 600 mg/kg composite probiotics groups,were increased by 15.50% and 26.80% (P＜0.05),17.93% and 19.92% (P＜0.05),18.06% and 21.94% (P＜0.05),respectively.(3)The economic benefits of raising four groups of fast yellow feathered broiler chickens were 1114.13,1248.18,1322.14 and 1303.77 yuan,respectively.Among them,the total weight gain,weight gain,and feeding economic benefits of the 400 and 600 mg/kg composite probiotics groups were significantly higher than those of the 0 mg/kg composite probiotics group(P＜0.05).Conclusion:In the rapid breeding of yellow feathered broiler chickens,composite probiotics can improve growth performance,immune function,and economic benefits.The appropriate level of adding composite probiotics is 400 mg/kg.
composite probioticsfast type yellow feathered broiler chickengrowth performanceimmune functioneconomic benefits
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