Laboratory Animals > Volume 8, Number 1 > Pp. 61-69

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Sex ratio and weaning bodyweight differences in the offspring of unisexually- and bisexually-reared cross-fostered rats

R. M. Sharpe and A. C. Wyatt

Department of Pharmacology, University of Bristol Medical School, University Walk, Bristol, BS8 1TD; Department of Pharmacology, University of Bristol Medical School, University Walk, Bristol, BS8 1TD

When mated, unisexually-reared female rats produced a significant excess of females in their litters, while males predominated significantly in litters produced by bisexually-reared females. The percentage of female offspring produced by both types of females declined with successive litters. 1st litter offspring of unisexually-reared females were significantly heavier, and generally less variable in weight at weaning than the comparable offspring of bisexually-reared females, a difference which was apparently maternally-induced. These differences in weaning bodyweight disappeared, or were reversed in favour of the offspring of bisexually-reared females, in 2nd litters.

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