热应激状态下羊的体温调节

发布时间：2018-05-11 22:13

本文选题：山羊 + 绵羊　；参考：《动物营养学报》2017年07期

【摘要】：热应激是由高温环境所引起的,在炎热的气候条件下,当环境有效温度超过羊的等热区上限温度时,羊就会出现热应激。由热应激引发的不良影响广泛存在,不仅严重影响羊的生存质量,而且导致羊体温升高、生长性能降低、免疫力减弱以及肉品质下降。本文综述了导致羊产生热应激的因素以及热应激条件下的体温调节机制。在热应激的情况下,机体通过吸收环境辐射热和累积机体代谢产热,使机体获得很高的热负荷,超过了机体的散热能力。暴露在高温环境中的羊只,可通过增加机体散热消除过多的热负荷。当空气温湿度发生变化时,作为恒温动物,绵羊和山羊可以通过调整自身的产热量、采食量、饮水量、呼吸频率和行为等方式,来维持机体产热和散热的平衡。总之,羊可以利用复杂有效的散热机制维持体温平衡,适应高温环境。
[Abstract]:Heat stress is caused by high temperature environment. In hot climate, when the effective temperature of environment exceeds the upper temperature of the equal heat zone of sheep, the sheep will appear heat stress. The adverse effects caused by heat stress are widespread, which not only seriously affect the quality of life of sheep, but also lead to the increase of body temperature, the decrease of growth performance, the weakening of immunity and the decline of meat quality. This paper reviews the factors leading to heat stress in sheep and the mechanism of body temperature regulation under heat stress. Under the condition of heat stress, the body gains a high heat load by absorbing environmental radiation heat and accumulates heat production by metabolism, which exceeds the body's ability to dissipate heat. Sheep exposed to high temperature can eliminate excessive heat load by increasing heat dissipation. When air temperature and humidity change, sheep and goats, as isothermal animals, can maintain the balance of heat production and heat dissipation by adjusting their own heat production, intake, drinking water, respiratory frequency and behavior. In short, sheep can use complex and effective heat dissipation mechanism to maintain temperature balance and adapt to high temperature environment.
【作者单位】：内蒙古农业大学动物科学学院;
【基金】：国家重点研发计划项目(2016YFD0500508)
【分类号】：S826;S827

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