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《Chinese Journal of Animal Nutrition》 2010-06
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Effects and Mechanism of γ-aminobutyric Acid on Laying Performance and Egg Quality of Laying Hens under High Temperature in Summer

LI Hui TANG Feijiang SUN Tao ZOU Xiaoting ZHOU Bin(Key Laboratory of Molecular Animal Nutrition of Ministry of Education,Feed Science Institute,Zhejiang University,Hangzhou 310029,China)  
This study was designed to investigate the effects of γ-aminobutyric acid(GABA) on laying performance and egg quality of laying hens under high temperature in summer,and to study the mechanism of action from antioxidation,immunity and endocrine.Four hundred and eighty 320-day-old Roman hens were randomly divided into five groups with three replicates per group and thirty-two hens per replicate.One group received the basal diet as a control,while the others received the basal diet supplemented with 25,50,75,100 mg/kg GABA as treatments,respectively.The experiment lasted for 60 days.The results showed as follows: 1) laying performance of hens in all treatments was improved(P0.05),while feed intake was not significantly affected(P0.05),and 50 mg/kg was the optimal dosage which significantly increased laying rate and average egg weight(P0.05),and significantly decreased feed/egg ratio(P0.05).2) 50 mg/kg GABA significantly increased eggshell strength(P0.05),improved albumen height and Haugh unit(P0.05),and decreased cholesterol content of egg yolk(P0.05).3) GABA at 50 mg/kg significantly increased serum GSH-Px and SOD activities(P0.05),and decreased serum MDA content(P0.05).It also significantly increased FSH,E2,T3,FT3,IgG,IgA and complement C3 contents in serum(P0.05).In conclusion,supplementing γ-aminobutyric acid in a diet can effectively improve the laying performance,egg quality and heat stress resistance capability of hens by enhancing the antioxidant capacity,immune function and increasing the secretion of gonadal and thyroid hormones.The optimal dosage of GABA is 50 mg/kg.
【Fund】: 国家蛋鸡产业技术体系建设专项资金资助(nycytx-41)
【CateGory Index】: S831
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