Research the effect of rice peptide on the production performance and blood of physiological and biochemical indexes of laying hen during heat stress. 320 laying hens were randomly divided into 4 groups with 4 replications and fed with different diets. No. 1 Group was fed with basal diet; the No. 2 ～ 4 groups were fed with rice peptide of 1%, 1.5% and 2% to replace soybean protein in basal diet. Result showed that: under the heat stress, adding 1.5%～2% rice peptide can evidently increase lay rate,feed intake,the level of serum fatty,total protein and thyrox-ine(P<0.05) ; can evidently decrease Feed conversion ratio,blood sugar,and the level of aldosterone and cortisol (P<0.05).The mortality rate was also decreased. It indicated that the use of rice peptide of 1. 5%～2% exhibits good effect on the production performance and indexes of physiological and biochemical of laying hens.%研究在热应激的情况下,大米蛋白肽对蛋鸡生产性能和血液生理生化指标的影响.选择健康无病,体重相近的罗曼蛋鸡320只,随机分为4组,每组80只,下设4个重复,每个重复20只鸡.1组为对照组,2组、3组、4组为试验组,1组喂基础日粮,2、3、4组分别饲喂含1％、1.5％和2％的试验日粮.结果:在热应激条件下,添加1.5％～2％的大米蛋白肽能明显提高鸡的产蛋率、采食量、血液中的总蛋白、总脂和甲状腺素浓度(P＜0.05),显著降低产蛋鸡的料蛋比、血液中的血糖、醛固酮和皮质醇(P＜0.05),还能一定程度地降低鸡的死亡率.表明:在夏季,使用1.5％～2％的大米蛋白肽有利于提高蛋鸡的生产性能及改善相关的生理生化指标.
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