&gamma;-Aminobutyric Acid Affects Laying and Reproductive Performance of Broiler Breeders under Heat Stress

XIA Lei, ZHAN Xiuan, ZHU Qiaoming, WANG Yongxia, LIU Weilong, MA Yu

doi:10.3969/j.issn.1006-267x.2012.01.020

Chinese Journal of Animal Nutrition >

2012 , Vol. 24 >Issue 1: 137 - 144

DOI: https://doi.org/10.3969/j.issn.1006-267x.2012.01.020

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γ-Aminobutyric Acid Affects Laying and Reproductive Performance of Broiler Breeders under Heat Stress

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1. Feed Science Institute, Zhejiang University, Hangzhou 310058, China;
2. Zhejiang Xinxin Feed Co., Ltd., Jiaxing 314005, China

Received date: 2011-08-15

Online published: 2012-01-13

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Abstract

This experiment was conducted to study the effects of γ-aminobutyric acid (GABA) on the laying and reproductive performance of broiler breeders under heat stress, and to investigate the mechanism from antioxidation, immunologic function and liver-associated serum enzyme activities. A total of 360 Lingnan yellow broiler breeders (28-week-old) were randomly divided into 4 groups with 3 replicates in each group and 30 broiler breeders in each replicate. Diets of the four groups were supplemented with 0 (control group), 25, 50 and 75 mg/kg GABA in a basal diet, respectively. The preliminary trial period lasted for 14 days; trial period lasted for 56 days. The results showed as follows: compared with the control group, 1) supplemented 75 mg/kg GABA significantly increased laying rate, average egg weight, feed/egg ratio of broiler breeders (P<0.05), and also significantly increased fertilization and hatchability of eggs (P<0.05), birth weight (P<0.05) and birth rate (P<0.01) of chicks. Furthermore, supplemented 25 and 50 mg/kg GABA significantly increased hatchability and birth rate (P<0.05), and supplemented 25 GABA significantly increased birth rate of chicks (P<0.05). 2) Supplemented 75 mg/kg GABA significantly increased the contents of serum immunoglobulin A (IgA), immunoglobulin M (IgM) and complement C4 (P<0.05); supplemented 25 mg/kg GABA significantly increased the serum IgM content (P<0.05). 3) Supplemented 75 mg/kg GABA significantly increased the activities of serum superoxide dismutase, glutathione peroxidase (P<0.05) and total antioxidant capability (P<0.01), and decreased the serum malondialdehyde concentration (P<0.01); supplemented 25 mg/kg GABA also significantly decreased serum malondialdehyde concentration (P<0.05). It is concluded that supplementation of GABA can improve the laying and reproductive performance of broiler breeders under heat stress.

Key words： broiler breeders; GABA; heat stress; laying performance; reproductive performance

Cite this article

XIA Lei, ZHAN Xiuan, ZHU Qiaoming, WANG Yongxia, LIU Weilong, MA Yu . γ-Aminobutyric Acid Affects Laying and Reproductive Performance of Broiler Breeders under Heat Stress[J]. Chinese Journal of Animal Nutrition, 2012 , 24(1) : 137 -144 . DOI: 10.3969/j.issn.1006-267x.2012.01.020

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