Key factors for the efficiency of breeding programs for the improvement of litter size in sheep are presented, followed by a discussion about within-breed selection, crossbreeding and use of major genes. New tendencies concerning research on the optimization of litter size level are also described.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 237–244, 1994
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