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Journal of Dairy Science Vol. 46 No. 8 843-845
© 1963 by American Dairy Science Association ®
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Genetic and Environmental Factors Affecting Quiet Ovulations in Holstein Cattle1

Anant P. Labhsetwar, W. J. Tyler and L. E. Casida

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

ABSTRACT

Analysis of 3,076 ovulations covering 728 cow parities revealed the incidence of quiet ovulations to be 23.7%. Both sire-line and season had significant influences on the rate of quiet ovulations. A higher incidence of quiet ovulations occurred from March 1 to August 31 than from September 1 to February 28. Influence of system of mating was found to be nonsignificant, but its interactions with line and with parity were significant. A highly significant negative correlation between incidence of quiet ovulations and interval since calving in cows or 12 months of age in heifers was noted. A low but highly significant repeatability (0.04) within parity also was found.

FOOTNOTES

1 From the Department of Genetics (Paper No. 914) 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 Project entitled Improvement of Dairy Cattle Through Breeding—NC-2, conducted in cooperation with the Dairy Cattle Research Branch, USDA.






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Copyright © 1963 by the American Dairy Science Association ®.