TAILIEUCHUNG - báo cáo khoa học: "Re-examination of selection index for desired"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Re-examination of selection index for desired | Génét. Sél. Evol. 1986 18 4 499-504 Note Re-examination of selection index for desired gains Y. ITOH and Y. YAMADA Department of Animal Science College of Agriculture Kyoto University Kyoto 606 Japan Summary The method of index selection for desired genetic changes derived by Brascamp 1979 was re-examined and we found that his method gave the equivalent solutions to that of Yamada et al. 1975 . Brascamp s method is more complicated and has no advantage compared to the method of Yamada et al. Key words Selection index desired gains constrained selection index. Resume Nouvel examen des index de selection pour des gains génétiques espérés Nous avons réexaminé la méthode de sélection par index pour des gains génétiques espérés proposée par Brascamp 1979 et nous trouvons que sa methode fournit des solutions equivalentes à celles de Yamada et al. 1975 . La methode de Brascamp est plus compliquée et ne présente pas d avantage par rapport à celle de Yamada et al. Mots clés Index de selection gains espérẾs index de selection sous contrainte. A selection index for desired genetic changes was derived by Pesek Baker 1969 . They restricted themselves to the situations where the traits in the index are exactly the same as those in the aggregate genotype. Yamada et al. 1975 gave a more general solution. Their method is available even in situations where the index contains traits not included in the aggregate genotype. Similar results have been obtained by Harville 1975 Rouvier 1977 Essl 1981 and Tallis 1985 . The most different point of Yamada et al. 1975 from the others was that they did not assume any economic weight nor underlying aggregate genotypic value. Brascamp 1979 discussed another solution of this problem and a detailed derivation of his method was written in his review paper Brascamp 1984 . His method 500 Y. ITOH Y. YAMADA appears quite different from that of Yamada et al. 1975 but we found that they were exactly the same. Because the method of Yamada et al. is .

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