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Acclimatization of calves to a hot humid environment

Published online by Cambridge University Press:  27 March 2009

W. Bianca
W. Bianca
Affiliation:
The Hannah Dairy Research Institute, Kirkhill, Ayr
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Extract

1. Three calves were exposed in a climatic room to an environment of 40° C. dry-bulb and 38° C. wet-bulb temperature for up to 110 min. each day for 1-2 weeks.

2. These exposures produced progressive changes in the physiological reactions of the animals to heat:

(a) Rectal temperature and skin temperature (for a given time of exposure) declined. In consequence there was a marked increase in the tolerance time, i.e. in the time for which the animals could withstand the hot environment before reaching a rectal temperature of 42° C.

(b) Respiratory rate rose earlier and assumed higher levels (for given levels of body temperature).

(c) Heart rate decreased markedly.

3. These changes are discussed in relation to heat loss and heat production and have been interpreted as reflecting chiefly a reduction in the metabolic heat production of the animals.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 52 , Issue 3 , June 1959 , pp. 305 - 312
Copyright
Copyright © Cambridge University Press 1959

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References

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