TABLE 3.

Summary of the genetic parameters for backfat evaluated in five pig populations.

Population	${\sigma }_a^2$	${\sigma }_e^2$	${\sigma }_p^2$	h2
Synthetic	1.19 ± 0.04	1.01 ± 0.01	2.21 ± 0.04	0.54 ± 0.01
Pietrain	0.56 ± 0.02	0.57 ± 0.01	1.13 ± 0.02	0.50 ± 0.01
Landrace	0.55 ± 0.02	0.77 ± 0.01	1.32 ± 0.02	0.42 ± 0.01
Large-White	1.68 ± 0.05	1.56 ± 0.01	3.24 ± 0.05	0.52 ± 0.01
Duroc	0.78 ± 0.04	1.03 ± 0.02	1.82 ± 0.04	0.43 ± 0.01

${\sigma }_a^2$ , Variance additive; ${\sigma }_e^2$ , Variance environment; ${\sigma }_p^2$ , Variance phenotypic; h2, Heritability.