Am. Soc. Anim. Prod.
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Am. Soc. Anim. Prod. 1938:67-72
© 1938 American Society of Animal Science
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Nicking in dairy cattle

E. E. Heizer, M. C. Hervey, G. R. Barrett and G. W. Brandt

Ohio State University

Abstract

Conclusions: Evidence is presented that the phenomenon of nicking has occurred in the sires and herds included in this study. It is probably more prevalent than we appreciate at the present time. The lack of concrete evidence of nicking heretofore is explained by the confounding influences of environmental variations from farm to farm as well as the limited number of offspring of any one sire in average dairy herds. It is questionable if it will ever play an important part in dairy cattle breeding except in large herds or in the large organized artificial breeding societies of the future. In the meantime, breeders of dairy cattle may well afford to duplicate matings which are known to have given especially good results.

It is believed that heterosis is not the proper term for this occurrence, since it has been shown that some sires work best on closely related families. It is probable that these results are rather due to complementary effects of genes.






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Copyright © 1938 by the American Society of Animal Science.