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The Functional Relation of Yearly Feed Cost and Butterfat Production in Dairy Cattle

Bureau of Dairy Industry, United States Department of Agriculture; Washington Agricultural Experiment Station; Western Washington Experiment Station, Puyallup.

ABSTRACT

The yearly butterfat production of dairy cows is regulated and influenced by a number of hereditary and physical factors. The ability of an animal to produce a large amount of butterfat in a year is inherited. Unless the physical factors involved in butterfat production are adequately provided maximum production cannot prevail.

Many of the influential physical factors have been studied by various workers. When correlating them with yearly production they have found varying degreees of relationship to exist. Of the ten factors studied by Pound and Ezekiel (1) six were found to show a creditable degree of correlation with yearly butterfat production. Seventy-five per cent of the variation in the average butterfat yield of the herds studied could be accounted for by the following six factors mentioned in order of their importance: quality of management; nutritive ratio; total nutrients; fall freshening; proportion of silage in the ration, and fat test and the average yearly milk production in certain Wisconsin herbs.

^* The material included in this paper was collected by the author when matriculated in the College of Agriculture, University of Wisconsin.

Published as Scientific Paper No. 194, College of Agriculture and Experiment Station, State College of Washington.