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Fertilization Rates and Embryonic Death Rates in Cows Bred to Bulls of Different Levels of Fertility ¹

Department of Genetics, University of Wisconsin, Madison

ABSTRACT

Variation in nonreturn rates of different bulls used in artificial insemination is not clearly understood. Theoretically, it must be due to variation in fertilization failure or in embryonic death or in both, but there seems to be little information on the relative importance of these two factors. The variation of sperm motility, in both raw and processed semen, of the bulls that are in active use in artificial insemination centers is too little and the known association between motility and fertility is too low for predicting whether fertilization failure is a major factor. Variation in nonreturn rate due to genital infections of the bull with consequent embryonic death is a possibility, but the incidence of recognized infections is too low to be adequate as an explanation. The possibility of other bull factors affecting embryonic death has been suspected but not proven. The object of this study was to determine the relative importance for fertilization failure and embryonic death in the variation of the fertility of bulls in use in artificial insemination centers.

¹ Paper No. 530, Department of Genetics, University of Wisconsin. This work has been done under a cooperative agreement between the Wisconsin Agricultural Experiment Station and the Bureau of Dairy Industry, U.S.D.A. It has been supported in part by a grant from Badger Breeders' Cooperative.

² Agents of the Bureau of Dairy Industry, U.S.D.A.

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