饲粮添加玛咖多糖对产蛋后期蛋鸡产蛋性能、蛋品质、免疫指标及经济效益的影响OA

The experiment aimed to investigate the effects of maca polysaccharide on the laying perfor-mance,egg quality,immune function,and economic benefits of laying hens during late laying stages.600 60-week-old Hy-Line Brown hens were selected for the experiment and randomly divided into four groups,with 6 replicates in each group and 25 chickens in each replicate.Group A(control group)was fed a basic diet,while groups B,C and D were fed the basal diet supplemented with 500,1 000 and 1 500 mg/kg of maca polysaccharide,respectively.The pre-trial period lasted for 7 days,and the main trial period was 42 days.The results showed that compared with group A,the laying rate,average egg weight,and average daily egg weight of laying hens in groups B,C and D significantly increased(P<0.05);the rate of non-conforming eggs in groups C and D significantly decreased(P<0.05);the feed-egg ratio in groups B,C and D significantly decreased(P<0.05);there were no significant differences in average daily feed intake among the groups(P>0.05).Compared with group A,the egg shell strength of hens in groups C and D significantly improved(P<0.05),and the Haugh unit of eggs in groups B,C and D significantly increased(P<0.05);the serum levels of IgA,IgG,IgM,IL-2 and IFN-γ in hens in groups B,C and D all significantly increased(P<0.05);the economic benefits of groups B,C and D all improved,with the highest economic benefit achieved when the addition level was 1 000 mg/kg.