A considerable amount of published information which exists on sheep, is relevant to the problem of selection for improvement in reproductive rate of that species. The literature on some aspects of this problem has been reviewed. As a source of general background knowledge and for specific references, the reviews by R eev e and R o b er tso n (1953) and B radford (1972) with emphasis on multiple births in sheep, by T e r r il l (1958) on fifty years of progress in sheep breeding, by T u r n e r (1969) on genetic improvement of reproductive rate in sheep and by R ae (1956) on the genetics of the sheep, have been consulted extensively in preparation of the present paper. In this paper, the theme is organised around two topics about which published information seems to be scarce and their discussion here may, directly or indirectly, result in making selection more effective as a method of improving reproductive rate within a breed of sheep.

T. S Ch'ang, A. A Dunlop

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 713–723, 1974
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