Estimation and consequences of direct-maternal genetic and environmental covariances in models for genetic evaluation in broilers

Table 6 Observed accuracies of prediction estimated per model on the simulated dataset using four tests

	Moda	Modam	Coram	Corepe	Coramepe	se
cor(TBV, EBV_reduced)	0.352	0.369	0.369	0.373	0.374	0.010
cor(y_c, EBV_reduced)	0.162	0.160	0.158	0.157	0.154	0.004
Halfsibs cor(y_c, EBV_reducedHS)	0.203	0.205	0.206	0.209	0.211	0.005
cor(EBV_full, EBV_reduced)	0.596	0.609	0.604	0.627	0.628	0.010

Observed accuracies of prediction are defined as the correlation between the true breeding values and the predicted breeding values (cor(TBV, EBV_reduced)); the phenotype corrected for fixed effects (y_c) and the predicted breeding values (EBV_reduced), either when these values were estimated for the same individual (cor(y_c, EBV_reduced)) or for paternal half-sibs pairs (Halfsibs cor(y_c, EBV_reducedHS)) and the breeding values estimated with the full dataset (EBV_full) and the one estimated using the reduced dataset (EBV_reduced). The accuracies were estimated for each model. The standard errors (se) are presented in the last column. Moda is the model for which no maternal genetic effects are included and for which the direct-maternal environmental covariance is null. Modam is the model for which both the direct-maternal genetic and the direct-maternal environmental covariance are null. Coram is the model for which the direct-maternal genetic effect is considered as non-null while the direct-maternal environmental covariance is null. Corepe is the model for which the direct-maternal environmental effect is considered as non-null while the direct-maternal genetic covariance is null. Coramepe is the model for which both the direct-maternal genetic and the direct-maternal environmental covariance are non-null

ISSN: 1297-9686