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Analysis of Variation in Some Factors Affecting Multiple Ovulations in Holstein Cattle¹

Departments of Genetics and Dairy Science, University of Wisconsin, and Dairy Cattle Research Branch, USDA, Madison

ABSTRACT

A total of 790 parities (728 noncystic and 62 cystic) covering 3,549 ovulations was analyzed for effects of sire-line, system of mating, parity, cystic condition, and individuality of the cow on the incidence of multiple ovulations. Sire-line had no significant influence. Frequency of multiple ovulations increased in association with the cystic condition and with increasing parity. Outbreds had a significantly higher incidence of multiple ovulations than inbreds. A highly significant repeatability (0.07) within a cow also was noted.

¹ From the Department of Genetics (Paper No. 913) and Department of Dairy Science; 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 Cooperative Research Project entitled Improvement of Dairy Cattle Through Breeding—NC-2, conducted in cooperation with the Dairy Cattle Research Branch, USDA.

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