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Comparison of Mates of Sires Used Artificially and Naturally in Michigan DHIA Holstein Herds^{1, 2,}

Department of Dairy, Michigan State University, East Lansing

ABSTRACT

Michigan DHIA Holstein records from 1944 to 1956 were analyzed to compare production levels of mates of sires used artificially (AB) and naturally (non-AB).

Purebred and grade mates were analyzed separately, since the former had higher levels of production and a higher average number of records than the latter. Purebred mates of AB sires did not produce significantly more milk or fat but did have significantly more records than non-AB purebred mates (12,794 lb. milk, 452 lb. fat, and 2.79 records for AB mates, and 12,711 lb. milk, 449 lb. fat, and 2.60 records for non-AB mates). Grade mates of AB sires did not produce significantly less milk or fat or have significantly more records than non-AB grade mates (11,537 lb. milk, 421 lb. fat, and 2.43 records for AB mates, and 11,659 lb. milk, 422 lb. fat, and 2.34 records for non-AB mates). Since AB and non-AB sires were mated to equally productive mates, and other workers have found no difference between AB and non-AB daughters, this study supports the conclusion that significant differences in transmitting ability have not been present between groups of AB and non-AB sires studied.

¹ Journal article No. 2295 from the Michigan Agricultural Experiment Station.

² These data are part of a thesis presented by the senior author to the College of Agriculture, Michigan State University, in partial fulfillment of the requirements of the degree of Master of Science.

³ Present address is Department of Dairy, Purdue University, Lafayette, Indiana.