J. Anim Sci.
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J. Anim Sci. 1975. 40:70-74.
© 1975 American Society of Animal Science
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Systematic Crossfostering within Control Lines1

J. J. Rutledge2 and A. B. Chapman

University of Wisconsin, Madison 53706

Abstract

The feasibility of systematically crossfostering within control lines was assessed in two lines of rats. This procedure generates full-sib covariances which are free of postnatal maternal effects and the effect of common environment. Also, it will tend to enhance the effective population size since parents will have a higher probability of transmitting genes to subsequent generations. Alterations of husbandry and data recording necessary to implement this procedure were minor. Thus, it was concluded that systematic crossfostering of control lines would be a useful procedure. Postnatal maternal effects on body weight or gain appear to be of less importance in the rat than in the mouse. The nurse component of variance accounted for 51% of the phenotypic variance in 2-week individual body weight in these data. The nurse component of variance dissipated rather rapidly, being almost zero for 6- and 9-week body weights. The dam x nurse component was small for all traits.

Footnotes

1 Paper No. 1739 from the Laboratoly of Genetics and No. 638 from the Department of Meat and Animal Science. Research was supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, and by the Program Project in Genetics, Giant No. GM15422, from the National Institutes of Health.

2 Present address: Department of Animal Sciences, University of Vermont, Burlington.






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Copyright © 1975 by the American Society of Animal Science.