Heritabilities for the puppy weight at birth in Labrador retrievers

BMC Veterinary Research

Table 2 Proportions of variance components influencing the individual birth weight of puppies. Comparison of the variance components of a model without covariates (1) and a model with covariates (2). The direct-maternal covariance was held at zero

Covariate/Variance	Model 1	Model 2
Heritability direct	0.21 ± 0.047	0.17 ± 0.041
Heritability maternal	0.22 ± 0.053	0.22 ± 0.049
Dam environmental proportion	0.07 ± 0.034	0.07 ± 0.031
Litter environmental proportion	0.14 ± 0.013	0.08 ± 0.010
Residual proportion	0.36 ± 0.033	0.46 ± 0.032
Total heritability*	0.32	0.28

* \( {h}_T^2=\left({\sigma}_d^2+0.5\bullet {\sigma}_m^2+1.5\bullet {\sigma}_{dm}\right)/{\sigma}_p^2 \)

ISSN: 1746-6148