J. Anim Sci.
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J. Anim Sci. 1972. 35:725-729.
© 1972 American Society of Animal Science
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Effects of Inbreeding on Fertility and Livability in Beef Cattle1

C. A. Dinkel, L. M. Anderson, W. R. Parker and W. R. Trevillyan2

South Dakota Agricultural Experiment Station, Brookings 57006

Abstract

THE effect of two mating systems, one inbred and the other essentially noninbred, on fertility and livability was studied on 1,343 records collected over a 13-year period at the Antelope Range Field Station. Mating system effects were significant (P < .005) for fertility with the control averaging 0.08 calves per mating higher than the inbred. The 0.07 difference in livability in favor of the control was significant (P<.10). Lines within mating system were not significantly different for fertility, but differences of 0.19 calves per mating in livability were significant (P<.025). The 0.14 difference among lines within the inbred system accounted for this significant line variation. Results of this analysis along with results previously published regarding inbreeding effects on growth would indicate that rather intense inbreeding could be practiced in a breeder's herd so long as reproduction was satisfactory. A breeder encountering the lower levels of reproduction typical of inbred line 2 would be ill advised to continue a closed mating system.

Footnotes

1 Published with the approval of the Director of the South Dakota Agricultural Experiment Station as Publication No. 1012 of the Journal Series. Cooperative with A.R.S., U.S.D.A. and a contribution to Regional Project NC-1.

2 The authors gratefully acknowledge the assistance of Dr. W. R. Harvey in the statistical analysis of these data.






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Copyright © 1972 by the American Society of Animal Science.