[Objective] To study the effects of gamma-aminobutyric acid(GABA) on performance of lactating sows during heat stress.[Method] A total of 14 sows at the same parity and with close expected date of childbirth and similar body weight were randomly divided into control group and experimental group.They were fed a common basal diet and a GABA(300 mg/kg) supplementary diet,respectively.The trial lasted for 21 d.[Result] The daily feed intake,lactation yield and average daily gain of piglets in the experimental group were increased by 9.4%,28.5% and 10.7%,respectively.The backfat of lactating sows was decreased less,and the same with the weaning-oestrus interval.The survival ratio of piglets was increased by 4.5%.Compared with the control group,the content of lactose and fat increased significantly,but other components almost did not change.[Conclusion] Supplementing GABA in diet can improve the performance of lactating sows and promote the growth of piglets effectively.
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