Figure 1.

Estimates of additive heritability, maternal heritability and estimates of animal permanent environmental variance as a proportion of total phenotypic variance for BW of cattle at different ages obtained with the random regression model. *h*^{2}_{a} = estimates of additive heritability; *h*^{2}_{m} = estimates of maternal heritability; *p*^{2} = proportion of animal permanent environmental variance in relation to the total phenotypic variance.