Journal of Endocrinology · 1958 · 47 citations · 0 references
Life SciencesAnimal SciencesAgingFertilityReproductive PhysiologyAge-related Fertility DeclineAge-specific FertilityMammalian DevelopmentMammalian ReproductionReproductive AgingRodent ReproductionAge-related Changes In FecundabilityAge-related Reproductive ChangesAge-specific Fecundity
SUMMARY In three related strains of rats the numbers of fertile females have been found to fall with age and with the birth of successive litters. In thirty-five rats belonging to these three strains, each of which had a minimum of eight litters, the second litter was generally bigger than the first. From then on, however, litter-size gradually fell until the animals ceased to breed.