Effect of heat stress on the behavioral and physiological patterns of Small-tail Han sheep housed indoors
Effect of heat stress on the behavioral and physiological patterns of Small-tail Han sheep housed indoors
复制标题
热应激对室内小尾寒羊行为和生理模式的影响
DOI：
10.1007/s11250-018-1642-3
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发表时间：
2018-12-01
影响因子：
1.7
通讯作者：
Wei, W. H.
中科院分区：
文献类型：
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作者：
Li, F. K.;Yang, Y.;Wei, W. H.
本试验旨在研究夏季室内热应激对小尾寒羊行为和生理的影响。根据性别，将16只成年动物分为两组，每组8只动物：一组8只公羊，一组8只母羊。采用温湿度指数（THI）评价热应激程度。所有绵羊均接受为期10天的实验前适应期，以适应实验饲料和环境。监测的生理参数为呼吸频率（RR）、直肠温度（RT）和心率（HR）。还记录了颈静脉血样的血液化学参数，包括血浆矿物质和血液代谢物。行为参数包括躺卧、站立、排泄、饮水、觅食、行走和反刍。研究结果表明，不同性别儿童的行为存在显著差异（站立，P= 0.001;行走，P= 0.049;反刍，P= 0.010），生理（RR，P= 0.0001; HR，P= 0.002; RT，P= 0.03;）和血浆矿物质和血液代谢物（钠，P= 0.047，磷，P= 0.002，T4，P= 0.041，皮质醇，P= 0.0047，P= 0.0001）。TG，P= 0.009），热应激也显著影响站立、躺卧、觅食、饮水行为、各项生理指标及部分血液生化指标与对照组相比，差异有显著性（P< 0.05）（氯化物、钠、磷、总蛋白、四碘甲状腺原氨酸、胆固醇、甘油三酯、肌酐、皮质醇和葡萄糖）。这些结果表明，母羊比公羊具有更好的高温耐受性，热应激可以改变室内饲养小尾寒羊的行为和生理模式。这些变化可以使绵羊更好地适应环境温度。
This study was conducted to investigate the effects of heat stress on the behavioral and physiological patterns in Small-tail Han sheep housed indoors in summer without climate control. Sixteen adult animals were allocated into two groups of eight animals, based on sex: one group of eight rams and one group of eight ewes. Temperature-humidity index (THI) was used to assess the degree of heat stress. All sheep were subjected to a 10-day pre-experimental period of habituation to the experimental feed and environment. Physiological parameters monitored were respiratory rate (RR), rectal temperature (RT), and heart rate (HR). Blood chemistry parameters were also recorded, including plasma minerals and blood metabolites, from jugular vein blood samples. Behavioral parameters were lying, standing, excreting, drinking, foraging, walking, and ruminating. The research findings showed that there were some significant differences of behavior (standing,P= 0.001; walking,P= 0.049; ruminating,P= 0.010), physiology (RR,P= 0.0001; HR,P= 0.002; RT,P= 0.03;) and plasma minerals and blood metabolites (sodium,P= 0.047; phosphorus,P= 0.002; T4,P= 0.041; cortisol,P= 0.0047; triglyceride,P= 0.009) between ram and ewe and that heat stress also significantly affected (P< 0.05) standing, lying, foraging and drinking behavior, all of the physiological parameters and some of the blood chemistry parameters (chlorides, sodium, phosphorus, total protein, tetraiodothyronine, cholesterol, triglyceride, creatinine, cortisol, and glucose). These results indicate that ewe has better high-temperature tolerance than ram, and heat stress can alter behavioral and physiological patterns in Small-tail Han sheep housed indoors. These changes may allow the sheep to adapt better to the ambient temperature.