Esterase Activity in the Bovine Sweat Gland: Genetic Differences and the Effect of Temperature

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Abstract
The esterase activity in the sweat glands of Brahman (B), Brahman crossbred (BX) and Shorthorn (S) steers was studied in animals exposed to low heat loads while grazing. The percentage of sweat glands containing esterase in the secretory cells of the fundus differed between genotypes and ranked in order of their heat tolerance, i.e., B > BX > S. Esterase activity in some of those secretory cells was reduced in B bulls by acute exposure to high air temperatures in a climate chamber. While the significance of the esterase-containing cells in the fundus of the bovine sweat gland is uncertain, the results suggest that they could represent the resting or relatively inactive stage of the secretory cells.

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