Correlations and overall differences between parent-offspring estimates of variance components and heritabilities and corresponding estimates generated from two animal models differing in use of replicated values or individual means.

1)Spearman-rank correlation tests were used to test the correlation (ρ) between the estimates. Two-tailed significances of are indicated as ***, **, *, † corresponding to P<0.001, P<0.01, P<0.05 and P<0.10 respectively.
2)The difference in magnitude between parent-offspring and animal model estimates were tested with Wilcoxon signed-rank tests. Alongside the Wilcoxon signed-rank Z statistic (ZW) and significance, we report the difference between the average animal model and average parent-offspring estimates in relation to the average parent-offspring estimate (in percent). For comparative purposes the variance components have been transformed to coefficients of variation (see methods) prior to the calculation of the percentages.