tailieunhanh - Báo cáo sinh học: "Phenotypic plasticity of body pigmentation in Drosophila: Relationships among estimates of inbreeding depression, dominance"

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:Phenotypic plasticity of body pigmentation in Drosophila: Relationships among estimates of inbreeding depression, dominance. | 319 Genet Sei Evol 1997 29 319-326 Elsevier Inra Original article Relationships among estimates of inbreeding depression dominance and additive variance for linear traits in Holsteins I Misztal1 TJ Lawlor2 N Gengler1 1 Animal and Dairy Science Department University of Georgia Livestock-Poultry Building Athens GA 30602 2 Holstein Association Brattleboro VT 05302 USA Received 26 November 1996 accepted 20 May 1997 Summary - Estimates of dominance and additive variances were obtained for 14 linear traits. The data included 600 678 first parity records on 14 linear traits in Holsteins. The model included management groups age at calving additive and dominance effects and regression on inbreeding percentage. The estimate of the dominance variance was of the phenotypic variance for body depth for strength for stature and was less than 5 for the remaining traits. The additive variance ranged from for foot angle to for stature. No clear relationship was found between the estimates of dominance and additive variance larger negative estimates of the inbreeding depression were associated with higher estimates of the dominance variance. type traits dominance inbreeding variance components Resume Relations entre estimées de depression de consanguinité de variances génétiques additives et de dominance pour les caractères de conformation en race Holstein. Des estimées de variances génétiques additives et de dominance ont été obtenues pour 14 caractères de conformation en race Holstein 600 678 résultats de premiere lactation . Le modèle incluait les effets groupes de conduite l âge au vêlage les effets génétiques additifs et de dominance et la regression sur le taux de consanguinité. La variance génétique de dominance a été évaluée à 9 8 de la variance phénotypique pour la profondeur du corps à 8 0 pour la puissance 6 9 pour la taille et moins de 5 pour les autres caractères. La variance génétique additive a varié de 12 2 pour I angle du pied à 45 3 pour la .