Effects of acute and chronic heat stress on plasma metabolites, hormones and oxidant status in restrictedly fed broiler breeders

文献类型： 外文期刊

第一作者： Xie, Jingjing

作者： Xie, Jingjing;Tang, Li;Lu, Lin;Zhang, Liyang;Luo, Xugang;Tang, Li;Lin, Xi;Liu, Hsiao-Ching;Odle, Jack

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关键词： broiler breeder;heat stress;metabolite;hormone;oxidation

期刊名称：POULTRY SCIENCE （ 影响因子：3.352； 五年影响因子：3.679 ）

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收录情况： SCI

摘要： Heat tolerance can be improved by feed restriction in broiler chickens. It is unknown whether the same is true for broiler breeders, which are restrictedly fed. Therefore, the current study was conducted to study the effects of heat stress on plasma metabolites, hormones, and oxidative status of restricted fed broiler breeders with special emphases on the temperature and latency of heat exposure. In trial 1, 12 broiler breeders were kept either in a thermoneutral chamber (21 degrees C, control, n = 6) or in a chamber with a step-wise increased environmental temperature from 21 to 33 degrees C (21, 25, 29, 33 degrees C, heat-stressed, n = 6). Changes in plasma total cholesterol, glucose, and triiodothyronine (T-3) were closely related to the environmental temperature. When the temperature reached 29 degrees C, plasma T-3 (P < 0.05) was significantly decreased in acute heat-stressed birds, whereas plasma glucose (P < 0.001) and cholesterol (P = 0.002) increased only when the temperature reached 33 degrees C. Plasma triglyceride (P = 0.026) and creatine kinase (CK, P = 0.018) were lower in heat-stressed birds than controls regardless of the temperatures applied. In Trial 2, 24 broiler breeders were divided into 2 groups and raised under 21 degrees C and 32 degrees C for 8 weeks, respectively. Total cholesterol was increased in chronic heat-stressed broiler breeders after 4 weeks. Plasma lactate dehydrogenase (LDH, P = 0.047) and glutamic-oxaloacetic transaminase (GOT, P = 0.036) was up-regulated after 6 weeks of thermal treatment, whereas plasma CK (P = 0.009) was increased at the end of thermal treatment. Plasma malonaldehyde, protein carbonyl content, activity of total superoxide dismutase (SOD), and corticosterone content were not altered after acute and prolonged heat challenges. Taken together, acute heat stress primarily resulted in disturbance of plasma metabolites, whereas chronic heat stress caused tissue damage reflected by increased plasma LDA, GOT, and CK. During acute heat stress, plasma metabolites were minimally disturbed in broiler breeders until the environmental temperature reached 33 degrees C.

分类号： S8

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