Evaluation of the phenotypic and genomic background of variability based on litter size of Large White pigs

Table 2 Estimates of variance components, heritability, and the genetic coefficient of variation on the standard deviation level (\({\text{G}\text{C}\text{V}}_{\text{S}\text{D}\text{e}}\))

Estimate	TNB	LnVarTNB	varTNB
Permanent sow variance	0.86 (0.01)	–	0.15 (0.003)
Additive genetic variance	1.33 (0.2)	0.033 (0.001)	0.037 (0.002)
Residual variance	7.67 (0.8)	1.33 (0.4)	0.84
Heritability	0.135 (0.02)	0.024 (0.002)^a	0.036^a
\({\mathrm{GCV}}_{\mathrm{SDe}}\)^b	–	0.091	0.096

TNB: litter size as total number born
LnVarTNB: phenotypic variability of litter size estimated by the log-transformed variance of residuals
varTNB: phenotypic variability estimated with double hierarchical generalized linear model measured in 121,088 sows from the Large White pig population
^aHeritability is a measure of the reliability of EBV for LnVarTNB and varTNB; it does not reflect the magnitude of the genetic variance in varTNB
^bMeasure of the genetic variation in residual variance \({\mathrm{GCV}}_{\mathrm{SDe}}=\frac{{\upsigma }_{\mathrm{a}ddv}\left({\upsigma }_{\mathrm{e}}\right)}{\overline{{\upsigma }_{\mathrm{e}}}}\approx \frac{1}{2}{\upsigma }_{\mathrm{avar}} \,{\text{or} }\,\approx \frac{1}{2}{\upsigma }_{\mathrm{av}}\)

ISSN: 1297-9686