Regulation of body temperature of sheep in a hot environment

Author:

Brook AH,Short BF

Abstract

A study of the importance of sweating as a means of evaporative cooling in sheep was made by comparing the rectal temperatures of sheep with and without sweat glands, at an air temperature of 40°C and a water vapour pressure of 28.1 mm Hg. The experimental animals, all of which were shorn, comprised 2 ewes and 2 wethers without sweat glands, and 6 ewes and 4 rams with sweat glands. During the first hour the rise in rectal temperature of the sheep without sweat glands was greater than the rise in the normal animals (1.1°C v. 0.7°C). After 6½ hr. the mean rectal temperature was higher (40.6°C) in the sheep lacking sweat glands than in the normal ewes (39.9°C). The most rapid rise in rectal temperature after the first hour was that of the rams, which reached a mean value of 40.8°C. after 6½ hr. It is concluded that panting is the principal method of evaporative cooling in sheep. Sweating, though of lesser importance, is advantageous to the shorn animal, but its usefulness to sheep in wool is unknown.

Publisher

CSIRO Publishing

Subject

General Agricultural and Biological Sciences

Cited by 13 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Heat Exchange Between Animals and Environment: Mammals and Birds;Principles of Animal Biometeorology;2012-10-13

2. Dehydration increases the magnitude of selective brain cooling independently of core temperature in sheep;American Journal of Physiology-Regulatory, Integrative and Comparative Physiology;2007-07

3. Evaporação cutânea e respiratória em ovinos sob altas temperaturas ambientes;Revista Brasileira de Zootecnia;2003-12

4. Cutaneous water loss and respiration rates of various breeds of sheep at high ambient temperatures;Tropical Animal Health and Production;1979-02

5. Studies of the environmental physiology of tropical merinos;Australian Journal of Agricultural Research;1978

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