The effects of vitamin E on production performance,immune function,and antioxidant capacity of laying hens
To analyze the effects of vitamin E on the production performance,immune function,and antioxidant capacity of laying hens.480 Hailan brown laying hens at 30 weeks of age with similar egg laying rates were selected for the experiment and randomly divided into 3 groups,with 4 replicates in each group and 40 chickens in each replicate.All groups of laying hens were fed with basic diet,and the blank control group did not undergo styling treatment,while the temperature of the chicken coop was maintained at around 20℃;The temperature of the chicken coop in the heat stress group was maintained at around 30℃;The vitamin E group was supplemented with 300 mg/kg of vitamin E in the basic diet,and the temperature of the chicken coop was maintained at around 30℃.The pre trial period is 7 days,and the main trial period is 28 days.The results showed that:1)Compared with the blank control group,the average daily feed intake of the heat stress group decreased by 9.01% (P＜0.05),the egg production rate decreased by 9.00% (P＜0.05),the average egg weight decreased by 12.86% (P＜0.05),the average daily egg production decreased by 20.72% (P＜0.01),and the feed to egg ratio increased by 15.06% (P＜0.05).Compared with the heat stress group,the average daily egg production of the vitamin E group increased by 10.53% (P＜0.05).2)Compared with the blank control group,the serum IgG content in the heat stress group decreased by 12.85% (P＜0.05),the IgM content decreased by 9.49% (P＜0.05),and the TNF-α content increased by 10.39% (P＜0.05).Compared with the heat stress group,the serum IgM content in the vitamin E group increased by 9.80% (P＜0.05).3)Compared with the blank control group,the serum T-AOC and GSH Px activities in the heat stress group were significantly reduced(P＜0.05),and the MDA content was significantly increased(P＜0.05).Compared with the heat stress group,the serum T-AOC and GSH Px activities in the vitamin E group were significantly increased(P＜0.05),while the MDA content was significantly reduced(P＜0.05).It can be seen that heat stress reduces the production performance,immune function,and antioxidant capacity of laying hens,while adding vitamin E to the basic diet effectively alleviates the negative effects of heat stress on laying hens.
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