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Conséquences sur le progrès génétique laitier d’une sélection sur des caractères secondaires chez les bovins

Abstract : After successive selection on several traits using the exact relationship of JAIN & AMBLE (1962), genetic gain could be computed, by the algorithm of numerical integration of a multinormal distribution proposed by DUTT (1973, 1975). It reduces the usual restrictions on the number of stages and of selection criteria used. Using this algorithm in a theoretical selection scheme for dairy cattle, it was possible to study the impact on milk production of the selection for one or more secondary traits such as growth rate, beef conformation and dairy type. The loss in annual genetic gain for milk yield due to this selection and measured in comparison with a plan maximizing only the main trait, generally varied between 1.5 and 15 p. 100, depending on the context, genetic relationships between traits and applied selection intensity. This loss increased markedly when : a) the selection intensity on the secondary trait increased (in a non-linear way) ; b) the selection on milk production in the plan considered was less intensive ; c) the distribution of selection efforts according to the different pathways of genetic inheritance from one generation to the next was unbalanced ; d) the secondary trait was unfavorably linked to milk production, even for low correlations. This last point, which was particularly clear, and all these results in general, emphasize the need to limit selection objectives to only those characters which are definitely of economic value.
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  • HAL Id : hal-02719686, version 1
  • PRODINRA : 19279


Vincent V. Ducrocq. Conséquences sur le progrès génétique laitier d’une sélection sur des caractères secondaires chez les bovins. Genetics Selection Evolution, BioMed Central, 1984, 16 (4), pp.467-490. ⟨hal-02719686⟩



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