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Effect of Sire and System of Mating on Estimated Embryonic Loss¹

Departments of Genetics and Dairy Husbandry, University of Wisconsin and Dairy Husbandry Research Branch, Madison

ABSTRACT

A total of 837 services were analyzed for the effects of sire and system of mating on estimated embryonic mortality by 150 days of gestation. The sire had a highly significant effect on the rate of embryonic death in the females to which he was bred. Outbred embryos had an estimated death rate of 19.8% by 150 days as compared-to 22.3% for inbred embryos. Outbred dams had 19.2% embryonic death by 150 days, whereas embryonic mortality in inbred dams was 28.4%. Although the difference between outbreds and inbreds was not statistically significant in either case, the trend was for inbreeding of either embryos or dams, particularly the latter, to increase embryonic mortality.

¹ From the Department of Genetics (Paper No. 564) and Department of Dairy Husbandry; published with the approval of the director of the Agricultural Experiment Station. This study was supported in part by a grant from the Research Committee of the Graduate School from funds supplied by the Wisconsin Alumni Research Foundation and by a grant from the Emmons Blaine, Jr., Fund. Contribution from the Wisconsin Agricultural Experiment Station as a collaborator under the North Central Region Co-operative Research Project entitled "Improvement of Dairy Cattle Through Breeding—NC-2," conducted in cooperation with the Dairy Husbandry Research Branch, USDA.

² Agents of the Dairy Husbandry Research Branch.