TAILIEUCHUNG - báo cáo khoa học: "Sire evaluation with uncertain paternity"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Sire evaluation with uncertain paternity | Génét. Sél. Evol. 1987 19 1 83-102 Sire evaluation with uncertain paternity . FOULLEY D. GIANOLA and D. PLANCHENAULT . Station de Génétique quantitative et appliquée Centre de Recherches Zootechniques F 78350 Jouy-en-Josas Department of Animal Sciences University of Illinois Urbana Illinois 61801 . Institut d Elevage et de Médecine Vétérinaire des Pays Tropicaux 10 rue Pierre-Curie F 94704 Maisons-Alfort Cedex Summary A sire evaluation procedure is proposed for situations in which there is uncertainty with respect to the assignment of progeny to sires. The method requires the specification of the prior probabilities Pij that progeny i is out of sire j. Inferences about location parameters fixed environmental and group effects and transmitting abilities of sires are based on Bayesian statistical procedures. Modal values of the posterior distribution of these parameters are taken as point estimators. Finding this mode entails solving a nonlinear system of equations and several algorithms are suggested. The methodology is described for univariate evaluations obtained from normal or binary traits. Estimation of unknown variances is also addressed. A small numerical example is presented to illustrate the procedure. Potential applications to livestock breeding are discussed. Key words Sire evaluation uncertain paternity Bayesian methods. Résumé Evaluation des pères dans le cas de paternité incertaine Line methode devaluation des pères est proposée en situation d incertitude vis-à-vis de l assignation des descendants à leurs pères. La méthode requiert la spéciíication des probabilités a priori Pij que le descendant i provienne du père j. L inference des paramètres de position effets groupe et de milieu considérés comme fixes et valeurs génétiques transmises des pères est basée sur des procédures statistiques bayésiennes. Les valeurs modales de la distribution a posteriori de ces paramètres ont été prises comme estimateurs ponctuels. La recherche du mode .

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