Table 1.

Variance components and heritabilities for reproduction traits in Landrace and Large White pigs

Breeds	Traits	${\sigma }_a^2$	${\sigma }_e^2$	${\sigma }_p^2$	h2
Landrace	PWL	0.18	1.78	1.96	0.09
	BAL	0.28	2.04	2.32	0.12
	W2CL	1.45	16.20	17.65	0.08
	LSY	0.005	0.022	0.026	0.17
	PWSY	1.57	10.38	11.95	0.13
	NPD	84.05	385.70	469.75	0.18
Large White	PWL	0.30	2.15	2.45	0.12
	BAL	0.44	2.55	2.98	0.15
	W2CL	1.31	15.46	16.77	0.08
	LSY	0.01	0.02	0.03	0.25
	PWSY	2.78	12.09	14.87	0.19
	NPD	115.60	343.50	459.10	0.25

PWL, pigs weaned per litters; BAL, born alive per litters; W2CL, wean to conception interval per litters; LSY, litter per sow per year; PWSY, pig weaned per sow per year; NPD, non-productive day.