Results from simulation studies on REML estimation of genetic parameters from sampled traits in unselected populations and data in population undergoing selction are presented. Inclusion of correlated traits in a multiple trait analysis in unselected populations did not increase accuracy of heritability estimates, but did increase accuracy of estimates of genetic correlations. REML estimates of heritability were unbiased in unselected populations if all data and all relationships were incorporated in the model. If only recent data were included, estimates were still unbiased if all relationships were taken into account.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 281–284, 1990
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