Comparison of host genetic factors influencing pig response to infection with two North American isolates of porcine reproductive and respiratory syndrome virus

Table 4 Estimates of genetic correlations [genet cor. (standard errors)] between response to infection with the NVSL versus KS06 isolates and using different relationship matrices

Trait	Full (G)			Block diagonal (G _B)			Paired block diagonal (G _p)
	Heritability		Genet cor.	Heritability		Genet cor.	Heritability		Genet cor.
	NVSL	KS06	Genet cor.	NVSL	KS06	Genet cor.	NVSL	KS06	Genet cor.
VL	0.32 (0.06)	0.53 (0.07)	0.86 (0.19)	0.40 (0.06)	0.53 (0.08)	0.51 (0.24)	0.51 (0.08)	0.54 (0.09)	0.57 (0.22)
WG	0.33 (0.05)	0.30 (0.09)	0.86 (0.27)	0.37 (0.06)	0.32 (0.10)	0.96 (0.34)	0.41 (0.08)	0.38 (0.11)	0.90 (0.31)
TP	0.22 (0.05)	0.21 (0.09)	0.25 (0.33)	0.28 (0.06)	0.28 (0.10)	0.40 (0.36)	0.32 (0.08)	0.30 (0.12)	0.43 (0.36)
PV	0.17 (0.05)	0.46 (0.07)	0.94 (0.28)	0.23 (0.06)	0.43 (0.08)	0.94 (0.33)	0.29 (0.07)	0.42 (0.09)	0.91 (0.30)
Tmax	0.21 (0.05)	0.14 (0.09)	0.82 (0.53)	0.26 (0.06)	0.16 (0.10)	0.86 (0.59)	NE^a	NE	NE
Vmax	0.10 (0.05)	0.25 (0.09)	0.63 (0.51)	0.13 (0.05)	0.22 (0.10)	0.32 (0.67)	0.06 (0.06)	0.23 (0.12)	0.41 (0.92)

G = full G-matrix with all relationships included; G _B = block diagonal G-matrix, with the relationships between animals from different genetic backgrounds set to zero; G _p = paired block diagonal G-matrix, with the relationships between animals from different genetic backgrounds set to zero, and only included trials in which pigs from the same genetic background were infected with both NVSL and KS06
WG weight gain (kg), VL viral load (area under the Wood’s curve of log₁₀ serum viremia from 0 to 21 days post infection; viremia * days), TP time to peak viremia (days), PV peak viremia (log₁₀ serum viremia), Tmax time to maximal rate of viremia decay (days), Vmax maximal rate of viremia decay (log₁₀ serum viremia/day)
^aNE: were not estimated because the model did not achieve convergence in ASReml

ISSN: 1297-9686