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Relative Value of Continuous Production Testing and Artificial Insemination in Michigan Herds¹

Department of Dairy, Michigan State University, East Lansing

ABSTRACT

Records of milk and fat produced by each cow during a single day of test were obtained from 87 Holstein herds that had never been enrolled on any production-testing program. Each record was adjusted to its 305-day mature-equivalent, and the average lactation computed for each herd. By this same procedure, averages were obtained for all Holstein herds on test five or more consecutive years in the same counties as the nontested herds. Herds were classified into four groups by the proportions of cows sired by bulls in artificial insemination units, 100% A.I., more than 50% A.I., less than 50% A.I., and herds with no cows sired by A.I. bulls. Testing herds averaged 1,600 lb milk and 70 lb of fat more than nontested herds. Testing was superior to not testing in all degrees of A.I. There was not a significant difference in production between any of the A.I. groups.

¹ Journal Article No. 3456 from the Michigan Agricultural Experiment Station.