Abstract This experiment was conducted to study the effects of γ-amino butyric acid (GABA) on growth performance, blood biochemical indices and intestinal morphology of yellow-feathered broilers exposed to a high temperature environment. One hundred and forty four, 28-day-old male yellow-feathered broilers were separated into 2 groups with 6 replicates and 12 birds per replicate. The two experimental groups included: control group, which fed the basal diet, and GABA supplemented group, which fed the basal diet supplemented with 100 mg/kg GABA. After 7 days of feeding experimental diet at 26 °C, birds were fed the experimental diet and exposed to a high temperature environment at 35 °C and 60% RH for 14 days. Results revealed that average daily gain (ADG, p = .004) and average daily feed intake (ADFI, p = .003) of the GABA group were higher than control group, feed: gain ratio (F/G; p = .023) and mortality (p = .042) were lower than control group. The serum levels of glucose (GLU; p = .016), total cholesterol (T-CHO; p = .001), and low density lipoprotein (LDL; p = .001) as well as the activities of aspartate-aminotransferase (AST; p = .008), lactate dehydrogenase (LDH; p = .042) and creatine kinase (CK; p = .032) of the GABA group were lower than control group, while villus length (p = .016) of jejunum was higher than control group. In conclusion, adding 100 mg/kg GABA to diet can improve growth performance, reduce serum intracellular enzyme activities, protect the organs and intestinal morphology of yellow-feathered broilers exposed to a high temperature environment during 36-49 days of age. Highlights GABA improves growth performance of yellow-feathered broilers exposed to a high temperature environment. GABA protects the intestine of yellow-feathered broilers exposed to a high temperature environment.

中文翻译：

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日粮添加γ-氨基丁酸对高温环境下黄羽肉鸡生长性能、血液生化指标及肠道形态的影响

摘要 本试验旨在研究γ-氨基丁酸(GABA)对高温环境下黄羽肉鸡生长性能、血液生化指标和肠道形态的影响。将144只28日龄雄性黄羽肉鸡分为2组，6个重复，每个重复12只鸡。两个实验组包括：对照组，饲喂基础日粮，和 GABA 补充组，饲喂补充有 100 mg/kg GABA 的基础日粮。在 26 °C 下饲喂实验日粮 7 天后，将鸡饲喂实验日粮并暴露于 35 °C 和 60% RH 的高温环境中 14 天。结果显示平均日增重 (ADG, p = .004) 和平均日采食量 (ADFI, p = . GABA 组的 003) 高于对照组，饲料：增重比 (F/G; p = .023) 和死亡率 (p = .042) 低于对照组。葡萄糖 (GLU; p = .016)、总胆固醇 (T-CHO; p = .001) 和低密度脂蛋白 (LDL; p = .001) 的血清水平以及天冬氨酸转氨酶 (AST) 的活性; p = .008)，GABA 组的乳酸脱氢酶 (LDH; p = .042) 和肌酸激酶 (CK; p = .032) 低于对照组，而空肠的绒毛长度 (p = .016) 低于对照组高于对照组。综上所述，日粮中添加100 mg/kg GABA可以提高36-49日龄暴露于高温环境的黄羽肉鸡的生长性能，降低血清细胞内酶活性，保护器官和肠道形态。亮点 GABA 提高了暴露在高温环境中的黄羽肉鸡的生长性能。GABA保护暴露在高温环境中的黄羽肉鸡的肠道。