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Journal of Dairy Science Vol. 30 No. 2 79-85
© 1947 by American Dairy Science Association ®
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A Study of Heat Tolerance in Jersey Cows

R. F. Gaalaas1

Bureau of Dairy Industry, Agricultural Research Administration, U. S. Department of Agriculture

ABSTRACT

In a previous article, the author (1) reported that there was a strong correlation between air temperature and body temperature of Jersey cows when the air temperatures were above 75° F., and that there was a wide variaton in the body reaction of different cows under the same conditions. Rhoad (4, 5) has found this to be true also for beef cattle and has proposed using the body temperature (converted to a heat-tolerance coefficient for convenience) under standardized conditions as one of the criteria for judging the suitability of cattle for areas having considerable periods of high air temperatures (2, 3). Seath and Miller (6) analyzed data on Jersey and Holstein cows in Louisiana and found that relative humidity plays a minor role in comparison to air temperature as a factor influencing body temperature, respiration rate, and pulse rate.

The author has not found, in the published data on the characteristics of the heat tolerance of individual animals, answers to the following questions: (1) Is the body temperature of the individual sufficiently stable from year to year to be a sound measure of the heat tolerance of the animal, or, in other words, is the heat-tolerance coefficient a fixed individual characteristic, such as fat percentage?

FOOTNOTES

1 Formerly in charge of the dairy work at the Iberia Livestock Experiment Farm, Jeanerette, La. Now in charge of the Dairy Station, Mandan, No. Dak.






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Copyright © 1947 by the American Dairy Science Association ®.