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Surface Evaporation from the Normal Body Surface and with Sweat Glands Inactivated in Indian Cattle

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

ABSTRACT

The contribution of the sweat glands to skin surface evaporation under high temperature conditions was studied using areas on the rump of six Hariana and on the shoulders of six Gir heifers. The sweat glands were inactivated by three cataphoretic administrations of 10% formaldehyde. Evaporation rates were measured for five-minute periods by capsule technique from the two symmetrically opposite body locations after exposing the animals in a controlled room at 40.5 C for four to six hours. These were compared with rates recorded under similar conditions 15 days after one of the test sites on each animal had been treated with the formaldehyde. The formaldehyde suppressed the sweat gland activity 84% in Harianas and 79% in the Gir. Breed differences were not important, but the between-animal variances for rate from both treated and untreated areas were significant. The results corroborate the assumption that the major portion of the substance available for evaporation from the skin surface of cattle under thermal stress comes from the sweat glands.