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Effect of Atmospheric Temperature on Body Temperature and Respiration Rate of Jersey Cattle

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

ABSTRACT

An investigation to determine the effect of atmospheric temperature on the body temperature and the rate of respiration in Jersey cattle was conducted in 1941–42 at the Jeanerette, La., station of the Bureau of Dairy Industry. The station is in the Gulf coast region of Louisiana, and it is approximately 25 feet above sea level. The monthly mean air temperature normally ranges from 54° F. in January to 82° F. in July and August and is above 70° F. during the 5-month period from May to September, inclusive. The minimum temperature is seldom below 30° F. and the maximum is not often above 100° F. The relative humidity, however, is regularly high.

The herd of Jersey cows at this station is usually on pasture from late January to late November. Shade and water are available to the cows while they are on pasture; when they are not on pasture they are housed in a loafing shed and fed hay and silage.

¹ In charge of the dairy work at the Iberia Livestock Experimental Farm, Jeanerette, La.