Three lines differing markedly in reproductive performance as a result of long-term selection for litter size were compared for ovulation rates and uterine efficiency. Genetic differences in litter size were found to be due to genetic changes in ovulation rate with no evidence of altered uterine efficiency. Three additional lines also showed variation in litter size to be due to variation in ovulation rate rather than differences in uterine efficiency.
Proceedings of the New Zealand Society of Animal Production, Volume 42, , 25-28, 1982
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