J. Anim Sci.
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J. Anim Sci. 1970. 30:95-101.
© 1970 American Society of Animal Science
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Cutaneous Moisture Loss in the Bovine during Heat Exposure and Catecholamine Infusion1

M. B. Alvarez2, LeRoy Hahn3 and H. D. Johnson

University of Missouri, 4 Columbia

Abstract

An experiment was conducted to determine the effect of environmental heat exposure and catecholamine infusion on cutaneous moisture loss, pulse rate and rectal temperature. Five non-lactating Holstein cows housed in climatic chambers were allowed 3 weeks to adjust at 18 C, 50% RH and then exposed to 18 C, 50% RH and 35 C, 50% RH temperature treatments. At each temperature, saline, epinephrine and norepinephrine solutions were infused intravenously for 6 hours. Epinephrine was infused at a dosage rate of 0.25 mcg/kg/ min. At 18 C, epinephrine increased cutaneous moisture loss 300%, pulse rate 29% and rectal temperature 0.8%. At 35 C, epinephrine increased cutaneous moisture loss 55%, pulse rate 20%, but rectal temperature was not affected. The overall analysis indicated the increase in rectal temperature during epinephrine infusion was an environmental temperature effect and the increase in pulse rate a drug effect. The increase in cutaneous moisture loss during heat exposure and epinephrine infusion was explained in terms of the "blood flow-interstitial fluid volume theory", which was proposed as a mechanism for cutaneous moisture loss in bovines.

Footnotes

1 Contribution from the Mo. Agr. Exp. Sta. Journal Series No. 5442. Approved by the Director.

2 Rockefeller Foundation Fellow. Present address: Instituto Colombiano Agropecuario Apartudo aero 7984, Bogota, Colombia, South America.

3 Present address: A.R.S., University of Missouri, Columbia, Missouri 65201.

4 Department of Dairy Husbandry.






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