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首页> 外文期刊>Tropical Animal Health and Production >Physiological and haematological indices suggest superior heat tolerance of white-coloured West African Dwarf sheep in the hot humid tropics.
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Physiological and haematological indices suggest superior heat tolerance of white-coloured West African Dwarf sheep in the hot humid tropics.

机译：生理和血液学指标表明，在炎热潮湿的热带地区，白色西非矮羊具有较高的耐热性。

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摘要

Coat colour contributes to physiological adaptation in mammals and mediates response to thermal stress. Twenty-four adult West African Dwarf sheep of both sexes and with different coat colour types were used in this study. We measured rectal temperature (RT), respiratory rate (RR) and pulse rate (PR) before sunrise and sunset during the late dry season (January-March) and early rainy season (April-June) as well as packed cell volume (PCV), red blood cell (RBC) count, white blood cell (WBC) count, plasma sodium (Na+) and potassium (K+). Animals with black coat colour had the highest (P<0.05) mean values of 38.92+or-0.03 degrees C, 65.09+or-1.06 breaths/min, 81.35+or-0.78 beats/min, 1.70+or-0.01 for RT, RR, PR and heat stress index (HSI), respectively, followed by brown mouflon and brown with extensive white, while the Badger Face coloured sheep had the least mean values. There were significant (P<0.05) differences between male and female sheep for RT, RR, PR and HSI. Season had a significant (P<0.05) effect on RT, RR, PR and HSI. Coat colour and sex also significantly (P<0.01) affected RBC, WBC, Na+ and K+. Seasonal variation (P<0.05) in all the blood parameters was observed, with the exception of PCV. Interaction effect of coat colour and sex was significant (P<0.05) on RT and HSI. Correlation coefficients among the measured traits ranged from positive to negative values. These results indicate that selection of white-coloured sheep to attenuate heat stress is desirable in the hot humid tropics.Digital Object Identifier http://dx.doi.org/10.1007/s11250-012-0187-0
机译：毛色有助于哺乳动物的生理适应，并介导对热应激的反应。本研究使用了二十四只成年的西非矮人成年绵羊，它们具有性别和不同的外套颜色。我们在干燥后期（一月至三月）和雨季初（四月至六月）以及日出时的日落和日落之前测量了直肠温度（RT），呼吸频率（RR）和脉搏频率（PR）以及细胞体积（PCV） ），红细胞（RBC）计数，白细胞（WBC）计数，血浆钠（Na + ）和钾（K + ）。毛色为黑色的动物的最高（P <0.05）平均值最高，为38.92 +或-0.03摄氏度，65.09 +或-1.06呼吸/分钟，81.35 +或-0.78拍/分钟，RT为1.70 +或-0.01， RR，PR和热应激指数（HSI）分别为棕色穆夫隆和泛白的棕色，而Bad色绵羊的平均值最低。雄性和雌性绵羊的RT，RR，PR和HSI差异显着（P <0.05）。季节对RT，RR，PR和HSI有显着（P <0.05）影响。外套的颜色和性别也显着（P <0.01）影响了RBC，WBC，Na +和K +。除PCV外，所有血液参数均出现季节性变化（P <0.05）。毛色与性别的相互作用对RT和HSI的影响显着（P <0.05）。被测性状之间的相关系数从正值到负值不等。这些结果表明，在炎热潮湿的热带地区，最好选择白色绵羊来减轻热应激。数字对象标识符http://dx.doi.org/10.1007/s11250-012-0187-0

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