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Effects of Crossbreeding on Reproductive Performance of Dairy Cattle^{1, 2,}

Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

Data for this study were taken on the reproductive performance of 86 first-generation female progeny in the Dairy Cattle Crossbreeding Project of the Illinois Agricultural Experiment Station. The seven measures used were services per conception, age at first calving, interval from first service to conception, gestation length, calving interval, calving date to first heat, and calving date to first service.

For the seven measures used, estimates of the effect of system of mating were consistent, small, and nonsignificant. This evidence supports the concept of the relative unimportance of nonadditive gene action in effecting variation in the measures of reproductive performance used in this study.

¹ Data for this study were taken from the Dairy Cattle Crossbreeding Project in progress at the Illinois Agricultural Experimental Station. This is a cooperative project between the Dairy Cattle Research Branch of the ARS, USDA, and the Department of Dairy Science of the University of Illinois, and is a contributing project to Regional Project NC-2, The Improvement of Dairy Cattle Through Breeding.

² Data in this paper are from a thesis submitted by the senior author to the Graduate College of the University of Illinois in partial fulfillment of the requirements for the degree of Master of Science, August, 1960.