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Influence of air humidity on the partition of heat exchanges of cattle

Published online by Cambridge University Press:  27 March 2009

J. A. McLean  and
D. T. Calvert
J. A. McLean
Affiliation:
Department of Physiology, Hannah Dairy Research Institute, Ayr
D. T. Calvert
Affiliation:
Department of Physiology, Hannah Dairy Research Institute, Ayr
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Summary

The balance between heat production and heat loss and the partition of heat exchanges of cattle in relation to air humidity has been studied at two different air temperatures using a direct (gradient-layer) calorimeter.

Increasing humidity at 35 °C air temperature caused no significant change in heat production or in the level of total heat loss finally attained, but body temperature and respiratory activity were both increased.

Increasing humidity at 15 °C air temperature caused a small reduction in heat loss by evaporation but had no effect on sensible heat loss, body temperature or respiratory frequency.

Heat loss by evaporation amounted to 18% of the total heat loss at 15 °C and to 84% at 35 °C.

Heat loss by respiratory evaporation amounted to 54% of the total evaporative heat loss at 15 °C and to 38% at 35 °C.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 78 , Issue 2 , April 1972 , pp. 303 - 307
Copyright
Copyright © Cambridge University Press 1972

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References

REFERENCES

Brouawer, E. (1965). Report of sub-committee on constants and factors. In Energy Metabolism; Proceedings of 3rd Symposium, Troon, 1964, pp. 441–3. Publ. Eur. Ass. Anim. Prod., no. 11, ed. Blaxter, K. L.. London: Academic Press.Google Scholar
Hardy, J. D. (1949). Heat transfer. In Physiology of Heat Regulation and the Science of Clothing (ed. Newburgh, L. H.), p. 78. Philadelphia: W. B. Saunders.Google Scholar
Kibler, H. H. & Brody, S. (1953). Influence of humidity on heat exchange and body temperature regulation in Jersey, Holstein, Brahman and Brown Swiss cattle. Res. Bull. Mo. agric. Exp. sin, no. 522.Google Scholar
Klemm, G. H. & Robinson, K. W. (1955). The heat tolerance of two breeds of calves from 1 to 12 months of age. Aust. J. agric. Res. 6, 350–64.CrossRefGoogle Scholar
Knapp, B. J. & Robinson, K. W. (1954). The role of water for heat dissipation by a Jersey cow and a Corriedale ewe. Aust. J. agric. Res. 5, 568–77.CrossRefGoogle Scholar
McLean, J. A. (1963a). Measurement of cutaneous moisture vaporisation from cattle by ventilated capsules. J. Physiol., Lond. 167, 417–26.CrossRefGoogle ScholarPubMed
McLean, J. A. (1963b). The partition of insensible losses of body weight and heat from oattle under various climatic conditions. J. Physiol., Lond. 167, 427–47.CrossRefGoogle ScholarPubMed
McLean, J. A. (1963c). The regional distribution of cutaneous moisture vaporization in the Ayrshire calf. J. agric. Sci., Oamb. 61, 275–80.CrossRefGoogle Scholar
McLean, J. A. (1971). A gradient layer calorimeter for large animals. J. Instn Heat. Vent. Engrs 39, 1–8.Google Scholar
Ragsdale, A. C., Thompson, H. J., Worstell, D. M. & Brody, S. (1953). The effect of humidity on milk production and composition, feed and water consumption and body weight in cattle. Res. Bull. Mo. agric. Exp. Stn, no. 521.Google Scholar
Riek, R. F. & Lee, D. H. K. (1948a). Reactions to hot atmospheres of Jersey cows in milk. J. Dairy Res. 15, 219–26.CrossRefGoogle Scholar
Riek, R. F. & Lee, D. H. K. (1948b). Reaotions of Jersey calves to hot atmospheres. J. Dairy Res. 15, 227–32.CrossRefGoogle Scholar
Robinson, K. W. & Klemm, G. H. (1953). A study of heat tolerance of grade Australian Illawara Shorthorn cows during early lactation. Aust. J. agric. Res. 4, 224–34.CrossRefGoogle Scholar