Sub-models that accommodated single-traits and repeated measures were fitted to estimate genetic correlations between reproduction traits expressed at different ewe ages. The data were from the CSIRO Fine Wool Project and comprised 17324 reproduction records of Merino ewes on four reproduction traits recorded at ages two to four years. Correlations were estimated for each trait expression at a particular age and their later expressions and with their previous expressions. However, in order to obtain estimates, models had to be restricted or the resulting correlation estimates were associated with high standard errors. This approach can be used to identify the areas causing problems in estimating correlation structures, but cannot produce estimates of the correlation structure in absences of sufficient data.

S. Dominik, Andrew A Swan

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 24.10, 2006
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