Estimation models of variance components for farrowing interval in swine

Brazilian Archives of Biology and Technology

Aderbal Cavalcante Neto²  Jeffrey Frederico Lui¹  José Lindenberg Rocha Sarmento¹  Maria Norma Ribeiro¹  José Mauro Costa Monteiro¹  Carlos Fonseca¹  Humberto Tonhati¹ 

[1] ,Universidade Estadual Paulista Júlio de Mesquita Filho Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal Departamento de ZootecniaJaboticabal SP ,Brasil

关键词: Common litter;    maternal effect;    permanent environment;    heritability;    repeatability;    swine;   

DOI  :  10.1590/S1516-89132009000100009

来源: SciELO

【 摘 要 】

The main objective of this study was to evaluate the importance of including maternal genetic, common litter environmental and permanent environmental effects in estimation models of variance components for the farrowing interval trait in swine. Data consisting of 1,013 farrowing intervals of Dalland (C-40) sows recorded in two herds were analyzed. Variance components were obtained by the derivative-free restricted maximum likelihood method. Eight models were tested which contained the fixed effects(contemporary group and covariables) and the direct genetic additive and residual effects, and varied regarding the inclusion of the maternal genetic, common litter environmental, and/or permanent environmental random effects. The likelihood-ratio test indicated that the inclusion of these effects in the model was unnecessary, but the inclusion of the permanent environmental effect caused changes in the estimates of heritability, which varied from 0.00 to 0.03. In conclusion, the heritability values obtained indicated that this trait appears to present no genetic gain as response to selection. The common litter environmental and the maternal genetic effects did not present any influence on this trait. The permanent environmental effect, however, should be considered in the genetic models for this trait in swine, because its presence caused changes in the additive genetic variance estimates.

【 授权许可】

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