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Live Weight and Milk-Energy Yield in the Wisconsin Dairy Cow Competition

Illinois Agricultural Experiment Station, Urbana, Illinois

ABSTRACT

Records of 369 cows (Jersey, Guernsey, Holstein—grade or registered) show that milk-energy yield per unit live weight is independent of live weight (r=–.O23). The same records show that gross efficiency (milk energy/feed energy) increases with live weight (r=+.345). Elimination of recognized systematic errors in the feed record may reduce the latter correlation to zero, making gross efficiency, in fact, independent of live weight. Then, a permissible deduction is that the feed of working maintenance is proportional to live weight.

In study of the genetics of milk yield in dairy cows, distinction should be made as to size of the organism which may be measured by live weight, and proclivity to lactation which may be measured by milk-energy yield per unit live weight.