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Intérêt de l'inclusion de l'information au locus majeur dans l'indice de sélection

Abstract : Two indexes were compared for the selection of a quantitative trait in the case of a mixed inheritance. The first index did not consider the major genotype information (standard method) whereas the second index took this information into account (modified method). Two types of selection scheme were considered: individual selection and selection based on a progeny test. The model for the estimation of genetic progress and evolution of allele frequencies takes overlapping generations into account. All of the effects studied suggested a large number of interactions. However, it can be concluded that information about the major gene should be put into the selection indexes when the heritability is low, the major gene effect high and its initial frequency small, in particular for a recessive major gene. The selection pressure has little influence on the results. In the short term, the modified method is of more value in the case of individual selection than in the case of selection based on a progeny test. On the whole, the extra genetic gain of the modified method is limited and considering the major genotypes in the selection indexes without any change of the selection scheme is probably not the best way to use this information.
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  • HAL Id : hal-02684167, version 1
  • PRODINRA : 132387

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Catherine Larzul, Eduardo Manfredi, Jean Michel Elsen. Intérêt de l'inclusion de l'information au locus majeur dans l'indice de sélection. Genetics Selection Evolution, BioMed Central, 1997, 29 (2), pp.161-184. ⟨hal-02684167⟩

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