To demonstrate that animal stocks with increased reproductive longevity can be developed by selective breeding, experiments using mice were conducted. A base population synthesized from mouse lines characteristic of increased lactational performance and adult body weight was used to develop two selected lines and one control line. Parents that were pair-mated at 7 weeks of age were selected mainly based on reproductive longevity. At generation 16, the two selected lines (one with litter size standardized at birth and the other not standardized) showed a significantly (P<0.01) longer life of reproduction than the control. Concomitant increases in lifetime performance such as total number of progeny produced per pair-breeder during lifetime were observed. Conclusions were that (1) reproductive longevity can be mcr-ased by selective breeding and (2) lifetime performance of animals improved as a correlated response to selection for reproductive longevity.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 107–110, 1994
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