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Heat tolerance in dehydrated steers

Published online by Cambridge University Press:  27 March 2009

W. Bianca
W. Bianca
Affiliation:
Department of Physiology, The Hannah Dairy Research Institute, Ayr, Scotland
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Extract

Six steers kept in an environment of 15°C. were deprived of water for four consecutive days. This treatment, by depressing appetite, caused a reduction in voluntary hay intake to one-quarter of its normal level and a decrease in body weight by 10%.

In spite of this reduction in feed intake, which must have been accompanied by a fall in metabolic heat production, the animals were less able to tolerate heat than when they were normally watered: during 4 hr. exposures to temperatures of 40.0°C. dry bulb and 32.5°C. wet bulb the waterdepleted animals showed higher values of rectal and skin temperature. This was associated with a slower initial rise and lower final values of respiratory rate (130 versus 155 respirations/min.).

Type
Research Article
Information
The Journal of Agricultural Science , Volume 66 , Issue 1 , February 1966 , pp. 57 - 60
Copyright
Copyright © Cambridge University Press 1966

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References

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