Selection for increasing litter size has a realized heritability of .10 to .20, while selection for decreasing litter size has higher realized heritability but reaches a selection limit in less generations. Selection for larger litter size has usually not responded beyond 30 generations. Using multiple-parity number bom for the selection criterion has been successful. Selection for components of litter size has, in most cases, shown response in number bom. Use of selection on testes size has not been consistently helpful for increasing litter size. One future direction may be to practice selection for a combination of ovulation rate and uterine capacity.

M. K Nielsen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 219–225, 1994
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