J. Anim Sci.
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J. Anim Sci. 1975. 41:113-117.
© 1975 American Society of Animal Science
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Plasma Cortisol and Total Progestin Levels in Holstein Steers during Acute Exposure to High Environmental Temperature (42 C) Conditions1

T. A. Abilay, R. Mitra and H. D. Johnson2

Animal Science Research Center, University of Missouri — Columbia, ,3 Columbia 65201

Abstract

Plasma cortisol concentration as estimated by CPB radioassay increased significantly in cattle during 4 hr of acute thermal exposure while plasma progestins did not. Changes in plasma cortisol were gradual with the onset of heat exposure and correlated significantly with rectal and environmental temperatures although the correlation was greater with rectal temperature. However, the rise and decline in plasma cortisol levels following, respectively, the onset and cessation of thermal exposure preceded changes in body temperature. Adrenocortical function in steers and the possible significance of plasma cortisol secretion during acute thermal stress are discussed.

Footnotes

1 Contribution from Missouri Agriculture Experiment Station Journal Series No. 6913. Approved by the Director. The data reported here are part of a thesis presented by the senior author to the Graduate School of the University of Missouri in partial fulfillment of the requirements of the degree of Doctor of Philosophy.

2 Assistant Professor, Department of Animal Science, UPCA; Research Specialist, Department of Pathology, University of Missouri Medical Center; and Professor, Department of Dairy Husbandry, University of Missouri, respectively.

3 Department of Dairy Husbandry.






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Copyright © 1975 by the American Society of Animal Science.