Relatively few estimates of genetic correlations between reproductive traits of ewes and other traits recorded early in life have been reported in sheep (Turner, 1969; Ch'ang and Rae, 1972).
This paper presents estimates of phenotypic and genetic correlations of several reproductive traits in ewes with a number of hogget traits recorded between 3 and 16 months of age. Ch'ang and Rae (1972) suggested that indirect selection, based on the measurement of yearling liveweight or number of hogget oestruses, could be more efficient in producing genetic gain in lamb production in New Zealand Romney sheep than direct selection. This question is also addressed here.

R. L Baker, J. N Clarke, A. H Carter, G. D Diprose

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 519–524, 1982
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