Table 4.

Variance components of the classical linear mean model and two double hierarchical generalized linear models DHGLM1 and DHGLM2 (root-transformed data)

Sub-model	Variance component	Classical	DHGLM1	DHGLM2
Mean	Sire-dam	-	-	0.019 ± 0.003
	Genetic1	0.082 ± 0.011	0.030 ± 0.007	0.078 ± 0.011
	Common environment	0.003 ± 0.002	0.016 ± 0.003	0.004 ± 0.002
	Residual	0.149 ± 0.006	-	-
	Heritability	0.350 ± 0.042	-	-
Variance	Sire-dam	-	0.040 ± 0.008	0.033 ± 0.007
	Genetic1	-	0.160 ± 0.032	0.133 ± 0.028

¹Genetic variance is defined as 4*sire-dam variance.