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Journal of Dairy Science Vol. 18 No. 6 389-399
© 1935 by American Dairy Science Association ®
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Influence of Season and Advancing Lactation on Butterfat Content of Jersey Milk

R. B. Becker and P. T. Dix Arnold

Florida Agricultural Experiment Station, Gainesville

ABSTRACT

The seasonal trend in fat percentage in the milk of Jersey cows in the more uniform environment of Florida was found to vary almost inversely with temperature. The lowest average butterfat tests occurred as a rule in August and the highest in December.

The average test of Jersey milk in the first month after calving was 4.605 per cent, dropped to 4.594 in the second month, and then increased steadily to the twelfth month.

Advancing lactation exerted a greater influence than did season of the year upon the percentage of fat in the milk of Jersey cows.

An average increase of 10° F. between monthly mean temperatures of 57° and 81° resulted in an average decrease of 0.31 per cent butterfat in Jersey milk, in a study of records obtained over a 16-year period.






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Copyright © 1935 by the American Dairy Science Association ®.