Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Genetic grouping for direct and maternal effects with differential assignment of groups | Genet Sei Evol 1992 24 211-223 Elsevier INRA 211 Original article Genetic grouping for direct and maternal effects with differential assignment of groups RJC Cantet1 RL Fernando2 D Gianola3 I Misztal2 1 Facultad de Agronomia Universidad de Buenos Aires Departamento de Zootecnia Av San Martin 4453 1417 Buenos Aires Argentina 2 Department of Animal Sciences University of Illinois Urbana IL 61801 3 University of Wisconsin Department of Dairy Science Madison WI 53706-1284 USA Received 13 March 1991 accepted 26 March 1992 Summary - Genetic grouping in additive models with maternal effects is extended to cover differential assignment of groups for direct and for maternal effects. Differential grouping provides a means for including genetic groups in animal evaluations when for example genetic trends for additive direct and for maternal effects are different. The extension is based on including the same animals in both vectors of additive direct and additive maternal effects and on exploiting the resulting Kronecker structure so as to adapt the rules of Quaas when maternal effects are absent. Computations can be performed while reading pedigree data and no matrix manipulations are involved. An example is presented to illustrate the computations. Extension of the procedure to accommodate multiple traits is indicated. genetic groups direct and maternal effects animal model best linear unbiased prediction BLUP Resume La constitution de groupes génétiques avec affectation differentielle selon les effets directs et maternels. La constitution de groupes génétiques dans le cadre de modèles additifs avec effet matemel est généralisée à une affectation differentielle à des groupes selon les effets directs et maternels. Ce regroupement differentiel fournit une methode pour inclure les groupes génétiques dans I evaluation des animaux quand par exemple les progrès génétiques pour les effets directs et maternels sont differents. Cette generalisation est basée sur I inclusion des mêmes
