Open Access

Multibreed analysis by splitting the breeding values

Genetics Selection Evolution200638:601

Received: 5 August 2005

Accepted: 27 June 2006

Published: 28 November 2006


An equivalent model for multibreed variance covariance estimation is presented. It considers the additive case including or not the segregation variances. The model is based on splitting the additive genetic values in several independent parts depending on their genetic origin. For each part, it expresses the covariance between relatives as a partial numerator relationship matrix times the corresponding variance component. Estimation of fixed effects, random effects or variance components provided by the model are as simple as any model including several random factors. We present a small example describing the mixed model equations for genetic evaluations and two simulated examples to illustrate the Bayesian variance component estimation.


segregation variance multibreed population genetic evaluation mixed model equations Gibbs sampler

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Authors’ Affiliations

Departamento de Mejora Genética Animal, SGIT-INIA
Departamento de Producción Animal, ETSI Agrónomos, Universidad Politécnica de Madrid


© INRA, EDP Sciences 2006