TAILIEUCHUNG - Báo cáo sinh học: "A dynamic deterministic model to evaluate breeding strategies"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh Original cung cấp cho các bạn kiến thức về sinh học đề tài: A dynamic deterministic model to evaluate breeding strategies. | Genet. Sei. Evol. 30 1998 127-148 Inra Elsevier Paris 127 Original article A dynamic deterministic model to evaluate breeding strategies under mixed inheritance Eduardo Manfredi Maria Barbieri Florence Fournet Jean Michel Eisen Station d amelioration génétique des animaux Institut national de la recherche agronomique Centre de Toulouse BP. 27 31326 Castanet-Tolosan cedex France Received 9 June 1997 accepted 10 March 1998 Abstract - A dynamic deterministic model is proposed to study the combined use of an identified major gene and performance information for selection of traits expressed in one sex. The model considers simultaneously combined adult selection via within genotype thresholds mating structures according to major genotypes and preselection of young males. The application given indicates that an optimum combination between performances and genotypic information yields better results in terms of polygenic means genotype frequencies and cumulated discounted genetic progress than classical selection ignoring the genotype information. The greatest advantage of combined selection occurs for rare recessive alleles of large effect on phenotypes up to 49 for polygenic gains 26 for total genetic gain . Optimum within genotype proportions of selected individuals and mating structures vary with generations thus highlighting the value of a dynamic approach. Inra Elsevier Paris dynamic selection major gene genetic marker model Resume - Un modèle déterministe et dynamique pour comparer des strategies de selection en hérédité mixte. Un modèle déterministe et dynamique est propose pour étudier 1 utilisation conjointe des performances et des genotypes à un locus majeur pour la selection des caractères exprimés dans un sexe. Le modèle prévoit la selection des adultes au-delà de seuils de performances intra-génotype des accouplements en fonction des genotypes et la preselection de jeunes males sur leur genotype. L application presentee indique que la combinaison optimale .

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