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Rectal Temperature and Respiratory Responses of Jersey and Sindhi-Jersey (F₁) Crossbred Females to a Standard Hot Atmosphere

Dairy Husbandry Research Branch, USDA, Beltsville, Md.

ABSTRACT

In the course of systematic studies of crossbred cattle resulting from an experimental breeding program made with Jerseys and Red Sindhi as the parent stocks, a number of F₁ Sindhi-Jersey females have been subjected to a standard hot atmosphere to determine their responses to hot atmospheric conditions. The effect of such exposures on rectal temperature and respiratory rate is reported in this paper.

EXPERIMENTAL CONDITIONS

Each female produced by the breeding program is subjected to the standard hot atmosphere for 6 hours at approximately 2-month intervals from 6 months of age onward except during the first lactation, which is left undisturbed for record purposes, and during the 45 days preceding each expected parturition. The test animals are placed in a climatic chamber on the afternoon preceding the test, but without any heat. Water, grain, and hay are allowed ad libitum during the afternoon. Grain is also offered the following morning, but all feed is withdrawn before the test is started.

¹ Professor of Physiological Climatology, Johns Hopkins University, Baltimore.