If a quantitative trait is affected by polygenes in which recessive brings beneficial effect. In that case, ordinary selection methods such as individual selection, family selection will not be efficient. Sometimes it may lead to a wrong selection. In order to show the existence of recessive favorable genes in quantitative traits, a comparison of purebred and crossbred selection has been done in an experiment on Drosophila. It is the result that selection on crossbred is more efficient than on purebred. The method of selection for recessive favorable genes is presented in this paper. It can be applied to improve performances of local breeds, especially to those traits which had been selected for a long time but still got very little progress.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 227–230, 1986
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