Research Article

Estimating additive and dominance variances for complex traits in pigs combining genomic and pedigree information

Published: June 11, 2015
Genet. Mol. Res. 14 (2) : 6303-6311 DOI: https://doi.org/10.4238/2015.June.11.4
Cite this Article:
(2015). Estimating additive and dominance variances for complex traits in pigs combining genomic and pedigree information. Genet. Mol. Res. 14(2): gmr5206. https://doi.org/10.4238/2015.June.11.4
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Abstract

Knowledge of dominance effects should improve ge­netic evaluations, provide the accurate selection of purebred animals, and enable better breeding strategies, including the exploitation of het­erosis in crossbreeds. In this study, we combined genomic and pedi­gree data to study the relative importance of additive and dominance genetic variation in growth and carcass traits in an F2 pig population. Two GBLUP models were used, a model without a polygenic effect (ADM) and a model with a polygenic effect (ADMP). Additive effects played a greater role in the control of growth and carcass traits than did dominance effects. However, dominance effects were important for all traits, particularly in backfat thickness. The narrow-sense and broad-sense heritability estimates for growth (0.06 to 0.42, and 0.10 to 0.51, respectively) and carcass traits (0.07 to 0.37, and 0.10 to 0.76, respec­tively) exhibited a wide variation. The inclusion of a polygenic effect in the ADMP model changed the broad-sense heritability estimates only for birth weight and weight at 21 days of age.

Knowledge of dominance effects should improve ge­netic evaluations, provide the accurate selection of purebred animals, and enable better breeding strategies, including the exploitation of het­erosis in crossbreeds. In this study, we combined genomic and pedi­gree data to study the relative importance of additive and dominance genetic variation in growth and carcass traits in an F2 pig population. Two GBLUP models were used, a model without a polygenic effect (ADM) and a model with a polygenic effect (ADMP). Additive effects played a greater role in the control of growth and carcass traits than did dominance effects. However, dominance effects were important for all traits, particularly in backfat thickness. The narrow-sense and broad-sense heritability estimates for growth (0.06 to 0.42, and 0.10 to 0.51, respectively) and carcass traits (0.07 to 0.37, and 0.10 to 0.76, respec­tively) exhibited a wide variation. The inclusion of a polygenic effect in the ADMP model changed the broad-sense heritability estimates only for birth weight and weight at 21 days of age.