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Journal of Dairy Science Vol. 43 No. 1 99-100
© 1960 by American Dairy Science Association ®
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Effect of Solar Radiation on Variations of Blood Constituents in Cattle1

H. M. Page2, E. S. Erwin3 and G. E. Nelms4

Department of Animal Science, University of Arizona, Tucson

ABSTRACT

The physiological alterations occurring during heat stress, together with the measurements for assessing heat stress in animals, have long intrigued research workers. Stress caused by high ambient temperatures may be elevated further by the added heat load of solar radiation. Reimerschmidt (6) reported that a bull during a midsummer day absorbed enough heat from solar radiation to raise 44 gal. of water from 0° C. to boiling. Since the bovine animal does not possess a sweating mechanism like man, the primary process for heat dissipation is mediated via convection and conduction. Consequently, when ambient temperature surpasses body temperature, the animal must alter its physiological processes in the attempt to maintain homeostasis.

While considerable data are available in the literature concerning the alteration of blood constituents in animals subjected to high ambient temperatures, limited information can be found regarding the effect of the added heat-load from solar radiation.

A carotene and vitamin A free ration was fed to four sets of identical twin cattle (approximately 800 lb. body weight) for 6 mo. prior to and during the experimental period.

FOOTNOTES

1 Arizona Agricultural Experiment Station contribution to the Regional Project W-46: The Effects of Environmental Stresses on Range Beef Cattle and Sheep Production. Arizona Agricultural Experiment Station Technical Paper No. 531.

2 Conducted in partial fulfillment for the degree of Master of Science.

3 Present address: Monsanto Chemical Co., St. Louis, Missouri.

4 Present address: Department of Animal Industry, University of Wyoming, Laramie.






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