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Journal of Dairy Science Vol. 61 No. 2 189-196
© 1978 by American Dairy Science Association ®
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Effect of Adrenocorticotropic Hormone on Plasma Glucocorticoids and Antidiuretic Hormone of Cattle Exposed to 20 and 33 C1

F. D. Ei-Nouty2, I. M. Elbanna3 and H. D. Johnson2

2 Department of Dairy Husbandry, University of Missouri, Columbia, MO 65201
3 Radiobiology Department, Atomic Energy Establishment, P.O. Box, Cairo

ABSTRACT

Four open, dry Holstein cows in the University of Missouri Climatic Laboratory were used to study the effect of adrenocorticotropic hormone administration on glucocorticoids and antidiuretic hormone of plasma in two reversal trials at thermoneutral (20 C, 50% relative humidity) and heat (33 C, 50% relative humidity) conditions. Average glucocorticoids (saline versus adrenocorticotropic hormone) at thermoneutral were 8.3 and 41.2 ng/ml while values for heat were 6.2 and 40.0 ng/ml. The effect of heat on glucocorticoids of plasma was not significant. Injection of adrenocorticotropic hormone under thermoneutrality and heat caused a marked increase in antidiuretic hormone within 5 min which lasted to 120 min. At thermoneutral average untidiuretic hormone levels (saline versus adrenocorticotropic hormone) were .5 and 1.9 pg/ml while values for heat were 1.8 and 3.6 pg/ml. Antidiuretic hormone concentrations under heat were higher than thermoneutral in cows injected with saline and andrenocorticotropic hormone. The fast response of antidiuretic hormone of plasma to exogenous adrenocorticotropic hormone suggests that adrenocorticotropic hormone might act directly at higher levels of the central nervous system causing release of antidiuretic hormone.

FOOTNOTES

1 Contribution from the Missouri Agriculture Experiment Station, Journal Series No. 7917, Approved by the Director.






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Copyright © 1978 by the American Dairy Science Association ®.