TABLE 1.

Heritability estimates (SE) and variance components of traits and their genetic correlation (r_g) with sample-to-positive (S/P) ratio for each PRRS phase and breed.

Trait	Duroc				Landrace
	h2 (SE)	${\mathrm{\sigma }}_{\mathbf{a}}^{\mathbf{2}}$	${\mathrm{\sigma }}_{\mathbf{e}}^{\mathbf{2}}$	rg (SE)	h2 (SE)	${\mathrm{\sigma }}_{\mathbf{a}}^{\mathbf{2}}$	${\mathrm{\sigma }}_{\mathbf{e}}^{\mathbf{2}}$	rg (SE)
Pre-PRRS
TNB	0.14 (0.04)	1.08	6.51	0.04 (0.19)	0.11 (0.03)	1.64	13.36	0.12 (0.21)
NBA	0.19 (0.04)	1.35	5.68	−0.04 (0.18)	0.13 (0.03)	1.42	9.86	0.15 (0.20)
NBD	0.01 (0.02)	0.01	1.47	NC	0.06 (0.03)	0.02	0.35	−0.18 (0.25)
NSB	0.05 (0.03)	0.01	0.21	0.48 (0.24)	0.10 (0.03)	0.03	0.26	−0.13 (0.21)
NBM	0.03 (0.02)	<0.01	0.13	−0.38 (0.31)	0.01 (0.02)	<0.01	0.18	0.01 (0.47)
NW	0.09 (0.03)	0.34	3.60	−0.34 (0.22)	0.07 (0.03)	0.46	5.83	0.05 (0.25)
PRRS
S/P ratio	0.35 (0.08)	0.032	0.059	–	0.34 (0.09)	0.033	0.063	–
TNB	0.12 (0.07)	1.15	8.27	0.23 (0.27)	0.01 (0.05)	0.14	15.25	0.47 (1.47)
NBA	0.11 (0.07)	1.20	9.67	−0.24 (0.30)	0.08 (0.07)	1.77	20.53	0.61 (0.34)
NBD	0.08 (0.06)	0.05	0.54	NC	0.12 (0.07)	0.10	0.71	−0.33 (0.32)
NSB	0.02 (0.05)	0.01	0.30	0.01 (0.54)	0.14 (0.08)	0.06	0.35	−0.27 (0.31)
NBM	0.03 (0.05)	<0.01	0.53	−0.08 (0.41)	0.08 (0.07)	0.07	0.84	−0.11 (0.37)
NW	0.12 (0.06)	1.28	9.00	0.30 (0.25)	0.08 (0.07)	1.40	15.86	0.10 (0.37)
Post-PRRS
TNB	0.15 (0.04)	1.37	7.58	−0.22 (0.17)	0.20 (0.04)	2.71	10.95	−0.06 (0.17)
NBA	0.13 (0.04)	0.98	6.79	−0.17 (0.18)	0.16 (0.04)	1.87	9.98	0.06 (0.18)
NBD	0.12 (0.04)	0.17	1.17	NC	0.10 (0.03)	0.04	0.33	−0.26 (0.20)
NSB	0.07 (0.03)	0.01	0.18	−0.04 (0.22)	0.12 (0.03)	0.03	0.23	−0.20 (0.19)
NBM	0.06 (0.03)	0.01	0.11	−0.17 (0.23)	0.01 (0.02)	<0.01	0.19	−0.33 (0.54)
NW	0.14 (0.04)	1.12	6.77	−0.11 (0.18)	0.14 (0.04)	1.45	8.78	−0.09 (0.20)

S/P ratio, sample-to-positive ratio; TNB, total number of piglets born; NBA, number of piglets born alive; NBD, number of piglets born dead; NSB, number of stillborn piglets; NBM, number of mummified piglets; NW, number of piglets weaned; NC, not converged.