TABLE 2.

Effect¹ of selected SNPs² associated with sample-to-positive (S/P) ratio during the PRRS outbreak for each breed.

SNP name	%TGVM3	Genotype			MAF	p-value
		AA	AB	BB
Duroc
ASGA0031860	<0.1	1.03 (0.07)	1.09 (0.04)	1.04 (0.03)	0.19 (A)	0.202
MARC0089437	9.2	0.86b (0.07)	1.10a (0.05)	1.21a (0.06)	0.41 (A)	0.002
ASGA0032063	<0.1	1.04 (0.03)	1.07 (0.05)	–	0.05 (B)	0.519
MARC0058875	0.2	1.04a (0.07)	0.97b (0.05)	1.15a (0.06)	0.41 (B)	0.018
ASGA0032151	<0.1	1.08 (0.06)	1.06 (0.04)	1.02 (0.04)	0.36 (A)	0.517
Landrace
ASGA0031860	<0.1	1.51 (0.11)	1.47 (0.10)	1.44 (0.10)	0.35 (A)	0.511
MARC0089437	<0.1	–	1.39a (0.05)	1.28b (0.02)	0.04 (A)	0.034
ASGA0032063	29.1	1.48b (0.12)	1.55a (0.10)	1.39c (0.10)	0.31 (A)	0.002
MARC0058875	<0.1	1.48 (0.10)	1.45 (0.10)	1.49 (0.11)	0.40 (A)	0.617
ASGA0032151	0.6	1.40b (0.10)	1.48ab (0.10)	1.53a (0.10)	0.41 (B)	0.054

%TGVM, percentage of the total genetic variance of S/P ratio explained by the marker; MAF, minor allele frequency (minor allele in parenthesis); PRRS, porcine reproductive and respiratory syndrome.

¹Results for each genotype expressed as expected values for S/P ratio (standard errors within parenthesis), measurement of antibody response to PRRSV.

²SNPs are located on Sus scrofa chromosome 7 as follow according to the Sscrofa11.1 (GCA_000003025.6) assembly: ASGA0031860/rs80959936 (7:22,075,114), MARC0089437/rs80900036 (7:24,217,931), ASGA0032063/rs80940999 (7:24,247,099), MARC0058875/rs80986722 (7:24,865,378), and ASGA0032151/rs80947467 (7:25,967,157). SNP markers MARC0089437 and ASGA0032063 were associated with S/P ratio in this study, in Duroc and Landrace populations, respectively. The other markers were associated with S/P ratio in Landrace sows in Serão et al. (2014).

³The remaining of the TGVM of the S/P ratio QTL after accounting for the %TGVM of these SNPs were 1.5% and <0.1%, for Duroc and Landrace, respectively.

^a–cExpected values within row lacking the same superscript indicate differences at p-value <0.05.