Abstract
Seasonal variation in sweat gland volume is reported in two breeds of Zebu dairy cattle. Changes which occurred in the volume of sweat glands in Jersey and in Zebu x Jersey cattle, as the result of sweating induced by exercise, are described. The crossbred cattle, which had larger sweat glands than the Jerseys, sweated at a greater rate, and had a smaller rise in rectal temperature, which returned more rapidly to normal. It is suggested that there is a relationship between sweat gland volume and activity, and that the seasonal changes in volume observed in the two Zebu breeds are largely due to changes in ambient temperature.

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