Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Assortative a mating and artificial selection : second appraisal | Génét. Sil. Evol. 1987 19 2 181-196 Assortative mating and artificial selection a second appraisal . SMITH and K. HAMMOND Animal Genetics and Breeding Unit University of New England Armidale NSW 2351 Australia Summary The impact on selection response of the positive assortative mating of selected parents was determined for a 2 generation cycle. Relative efficiency refers to the incremental response in the second generation and is defined as the per cent increase in selection response due to mating individuals assortatively instead of randomly. As determined by relative effidency assortative mating is most useful when heritability is large parental selection intensity is low and offspring selection intensity is high. Compared with selection on progeny phenotype the efficiency of assortative mating is greatly enhanced when progeny are selected on an index incorporating information on parents the influence being greatest at low heritabilities. Given 10 p. 100 of parents and offspring selected and a heritability of .05 relative efficiency under index selection is 5 p. 100 compared to only .4 p. 100 under mass selection. Over the range of offspring selection intensities considered relative efficiency under index selection varied between 5-3 p. 100 when heritability equals .05 with 10 p 100 of parents selected to 21-15 p. 100 when heritability equals .8 with 90 p. 100 of parents selected. Key words Index selection positive assortative mating selection. Résumé Homogamie et sélection artificielle une nouvelle evaluation On a déterminé pendant un cycle de 2 generations 1 effet sur la réponse à la selection de 1 homogamie positive de parents séíectionnỂs. L efficacité relative se rapporte à 1 accroissement de réponse obtenu chez les descendants issus de la 2 génération elle est définie comme le pourcentage d augmentation de la réponse à la selection due à Fhomogamie compạrée à des accouplements au hasard. En terme d efficacỉté relative I homogamie est surtout utile .
