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.

Jean-Michel Elsen, Loys Bodin, D. Francois, J. P Poivey, J. Teyssier

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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