饲粮添加中药复方对产蛋后期蛋鸡产蛋性能、蛋品质及血清生化指标的影响OA

This study aimed to investigate the effects of different additive levels of a traditional Chinese herbal compound on the production performance and egg quality of late-phase laying hens.A total of 832 Hy-Line White laying hens aged 336 days were selected and randomly divided into four groups based on similar egg production rates:the control group(fed with basal diet),the low-dose group(with basal diet+500 mg/kg herbal compound),the medium-dose group(with basal diet+1000 mg/kg herbal compound),and the high-dose group(with basal diet+2 000 mg/kg herbal compound).Each group contained four replicates with 52 hens per replicate.The experiment included a one-week adaptation period followed by an eight-week trial period.The feed intake,the number of eggs laid,defective eggs,and mortality of the hens were recorded throughout the experiment.Twelve eggs per group were randomly sampled for egg quality assessment.At the conclu-sion of the experiment,eight hens with similar body weights were selected from each group for cardiac blood collection,and the serum sam-ples were subsequently analyzed for biochemical parameters.The results were as follows:In terms of production performance,the medium-dose group significantly increased the egg production rate(P＜0.05),but significantly reduced the rate of defective eggs and the feed-to-egg ratio(P＜0.05),compared with the control group.Regarding egg quality,the medium-dose group showed significant improvements in the egg shape index and eggshell strength,compared with the control group(P＜0.05).The serum biochemical indicators indicated that all the dose groups(low,medium,and high)significantly reduced their AST,UA,and TG levels(P＜0.05).The present results suggested that the dietary supplementation effectively enhanced the production performance of laying hens,improved their liver and kidney function,and regulated lipid metabolism homeostasis in them.The medium-dose group(fed with basal diet+1000 mg/kg Chinese herbal compound)ex-hibited the most comprehensive efficacy.This finding provided an important theoretical support for extending the peak laying period of hens and developing functional feed additives.