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Hétérogénéité des variances de caractère d'animaux de race Montbéliarde

Abstract : This paper presents and discusses the estimation of genetic and residual (co-) variance components for conformation traits recorded in different environments using mixed linear models. Testing procedures for genetic parameters (genetic correlations between environments constant or equal to one, genetic correlation equal to one and constant intra-class correlations, homogeneity of variance-covariance components) are presented. These hypotheses were described via heteroskedastic univariate sire models taking into account genotype x environment interaction. An expectation-maximization (EM) algorithm was proposed for calculating restricted maximum likelihood (REML) estimates of the residual and genetic components of variances and co-variances. Likelihood ratio tests were suggested to assess hypotheses concerning genetic parameters. The procedures presented in the paper were used to analyze and to detect sources of variation on conformation traits in the Montbeliarde cattle breed using 24 301 progeny records of 528 sires. On all variables analyzed, several sources (stage of lactation, classifiers, type of housing) of heterogeneity of residual and genetic variances were clearly highlighted, but intra-class correlations between environments of type traits remained generally constant.
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  • HAL Id : hal-02684128, version 1
  • PRODINRA : 130519


Christèle Robert-Granié, Vincent Ducrocq, Jean Louis Foulley. Hétérogénéité des variances de caractère d'animaux de race Montbéliarde. Genetics Selection Evolution, BioMed Central, 1997, 29 (6), pp.545-570. ⟨hal-02684128⟩



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