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Effect of Drugs on Sweating Rates in Hariana Cattle¹

Indian Veterinary Research Institute, Izatnagar, U. P., India and Cornell University, Ithaca, New York

ABSTRACT

Five Hariana heifers were used in investigations to determine the effect of certain drugs on the rate of evaporation from the skin surface under temperature regimes of cool, 18.5 C; warm, 25.0 C; and hot, 40.5 C. Evaporation rates were measured by capsule technique from 10-cm² skin areas on the rump for five-minute durations. Under both cool and hot conditions adrenaline, pilocarpine, and acetylcholine stimulated sweat secretion significantly. The effect of adrenaline was most pronounced at 18.5 C, while the animation of acetylcholine and pilocarpine was more pronounced after thermal sweating had been induced. Atropine did not inhibit thermally induced sweating. However, when applied cataphoretically after the surface moisture loss was initially stimulated by acetylcholine and temperature, it reduced the moisture output to levels similar to that recorded from untreated skin. The results show that sweat glands in Hariana cattle are also adrenergic in nature. Acetylcholine did not seem to regulate sweating response, as atropine could not block or depress thermally induced sweating. When administered cataphoretically into the skin, acetylcholine and pilocarpine appeared to act directly on the sweat glands to evoke secretion. This action could, however, be blocked by atropine. Neither distilled water nor normal saline, when applied cataphoretically, stimulated sweating.

¹ These investigations were financed in part by a grant made by the United States Department of Agriculture, Agricultural Research Service, under Public Law 480.

² Present address: Department of Animal Physiology, Bengal Veterinary College, Calcutta,, India.