J. Anim Sci.
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J. Anim Sci. 1971. 32:26-34.
© 1971 American Society of Animal Science
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Relationships between Direct and Maternal Effects on Growth in Herefords: II. Partitioning of Covariance between Relatives1

W. D. Hohenboken2 and J. S. Brinks

Colorado State University, Fort Collins 80521

Abstract

PREWEANING growth in mammals is influenced by an individual's genotype for growth (direct genetic effects), by the genotype of the dam for maternal characters and by corresponding environmental effects (Willham, 1963). The importance of each effect independently has long been recognized. The nature of joint effects, however, has come under study more recently. Koch and dark (1955), Hill (1965) and Deese and Koger (1967) reported genetic antagonisms between direct and maternal effects on preweaning growth in beef cattle. Their observations suggest reevaluation of selection procedures to maximize preweaning growth.

A high nutritional environment conducive to rapid early growth of the beef heifer has been reported to be associated with poorer subsequent maternal performance evaluated as progeny weaning weight (see Mangus and Brinks, 1971, for review). This observation suggests altered recommendations for management of replacement heifers.

The study reported herein examines direct and maternal genetic and environmental effects on preweaning growth in Hereford cattle.

Footnotes

1 Approved for publication as Scientific Paper 1513 of the Colorado Experiment Station. The study was conducted in cooperation with Western Regional Research Project W-1, Improvement of Beef Cattle Through the Application of Breeding Methods.

2 Present address: Department of Genetics, University of Wisconsin, Madison.






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Copyright © 1971 by the American Society of Animal Science.