Abstract
Summary Data was presented showing seasonal variations of the percentage of fat in cow's milk derived from a study of 3763 Guernsey, 299 Jersey, and 95 Holstein-Friesian yearly records. The percentage of fat in milk when plotted follows a general curve, being lowest during the summer months, then gradually rising reaching a peak during the winter months and then again declining during the spring and summer. When the different seasons of the year are accompanied by varying temperatures, such as ordinarily prevail throughout the greater portion of the United States, the influence upon the per cent of fat in cow's milk is greater than that of the advance of lactation.
Published Version
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