[en] The most important nonadditive effect is probably dominance. Prediction of dominance effects should allow a more precise estimation of the total genetic merit, particularly in populations that use specialized sire and dam lines, and with large number of full-sibs, like pigs. Computation of the inverted dominance relationship matrix, D-1, is difficult with large datasets. But, D-1 can be replaced by the inverted sire-dam subclass relationship matrix F-1, which represents the average dominance effect of full-sibs. The aim of this study was to estimate dominance variance for longitudinal measurements of body weight (BW) in a crossbred population of pigs, assuming unrelated sire-dam subclass effects. The edited dataset consisted of 20,120 BW measurements recorded between 50 and 210 d of age on 2,341 crossbred pigs from 89 Piétrain sires and 169 Landrace dams. A random regression model was used to estimate variance components. Fixed effects were sex and date of recording. Random effects were additive genetic, permanent environment, sire-dam subclass and residual. Random effects, except residual, were modeled with linear splines. Only full-sib contributions were considered by using uncorrelated sire-dam classes. Estimated heritability of BW increased with age from 0.40 to 0.60. Inversely, estimated dominance decreased with age, from 0.28 to 0.01. Ratio of dominance relative to additive variance was high at early age (58.3% at 50 d) and decreased with age (2.6% at 200 d). Those results showed that dominance effects might be important for early growth traits in pigs. However, this need to be confirmed and dominance relationships will be included in the next steps.
Disciplines :
Genetics & genetic processes Animal production & animal husbandry
Author, co-author :
Dufrasne, Marie ; Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Jaspart, Véronique; Association Wallone des Eleveurs de Porcs
Wavreille, José; Centre wallon de Recherches agronomiques > Productions et filières
Gengler, Nicolas ; Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Language :
English
Title :
Estimation of dominance variance with sire-dam subclass effects in a crossbred population of pigs
Publication date :
August 2013
Event name :
64th Annual Meeting of the European Federation of Animal Science
Event organizer :
EAAP - European Federation of Animal Science
Event place :
Nantes, France
Event date :
26-30 August 2013
Audience :
International
Main work title :
Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science
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