Major genes. Genetic evaluation and selection [dairy cattle]
2000
Pilla, A.M. | Pilla, F. (Universita del Molise, Campobasso (Italy). Dipartimento di Scienze Animali, Vegetali e dell'Ambiente) | Pietrola, E.
It is shown that, at population level, the knowledge of allelic effects at major gene reduces the phenotypic and additive genetic variances and heritability. The individual additive genetic value is modified only for homozygotes and as more as the individual selection differential is nearer to zero. The error is the same for all individual additive genetic values. It is indicated how to calculate the response to selection when the allelic effects at major gene are known. It is concluded that, at population level, the marker-assisted selection is as efficient as mass selection, whichever is the fraction of selecting animals and allelic frequencies. In the finite population, the correspondence could not be observed only because of the error of the individual genetic additive values
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