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Official Records as Material for Studying Inheritance of Milk and Butterfat Production

Dairy Cattle Breeding Investigations, Bureau of Dairying, United States Department of Agriculture, Washington, D. C.

ABSTRACT

During the past two decades a large number of purebred cows of the dairy breeds have been officially tested for milk and butter-fat production. These tests have been carefully supervised by the agricultural colleges of the country, and the accuracy and thoroughness of this work is safeguarded by carefully drawn and rigidly enforced rules. The results of these tests as published by the breed associations in the various volumes of the Advanced Register and Register of Merit make up a vast reservoir of material of recognized value for the statistician.

For the purpose of assaying these records as material for studying the inheritance of milk and butterfat production, the initial and reëntry records of all cows of three breeds having two or more records have been arranged in age groups. This method of study was used in order to determine the correlation existing between records made at two different ages by the same group of cows.