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Journal of Dairy Science Vol. 46 No. 5 452-458
© 1963 by American Dairy Science Association ®
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Interactions between Sires in Artificial Insemination and Management of Dairy Herds1

J. M. Burdick and Lon D. McGilliard

Department of Dairy, Michigan State University, East Lansing

ABSTRACT

No interactions of practical importance were found between sires and herd environments classified by level of production, location, days dry, calving interval, or type of housing. The analyses included 8,638 Holstein and 1,872 Guernsey daughters of 193 and 139 A.I. bulls in 1,211 Holstein and 356 Guernsey herds tested in Michigan DHIA. Small differential responses of daughters of A.I. bulls in different herds were found within classifications, but these appear unimportant in selecting between bulls in A.I., except to require a few more daughters for a specified accuracy in evaluating the genetic abilities of the bulls. The ranking of the sires will generally be the same in any of the environments examined.

FOOTNOTES

1 Journal article No. 3097 from the Michigan Agricultural Experiment Station.






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