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Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Herdbook analyses of the Asturiana beef cattle breeds | 65 Genet Sei Evol 1994 26 65-75 Elsevier INRA Original article Herdbook analyses of the Asturiana beef cattle breeds J Canon1 JP Gutierrez1 s Dunner1 F Goyache2 M Vallejo1 1Facultad de Veterinaria Departamento de Production Animal 28040 Madrid 2Centro de Selection Animal CENSA Section de Genética Somió Asturias Spain Received 16 March 1993 accepted 12 October 1993 Summary - Data from 2 Asturiana breeds herdbooks were analysed to study their genetic structure. Herds were assigned to 3 levels by the use of herd sires. Generation intervals averaged 5.3 Casina and 5.4 Carrenana yr and for both breeds sires were significantly younger than dams. Determination of the important herds shows the contribution of Caso county 60 to the total herd appearance of the Casina breed. The overall mean Wright s inbreeding coefficients were 1.2 and 0.2 and the increases of inbreeding level per generation were 0.7 and 0.24 for Casina and Carrenana respectively. Those low values of inbreeding increase can be partially explained by a relatively low centralization reflecting a high degree of diversity. pedigree herdbook population structure beef cattle Resume Analyses des livres généalogiques des races bovines. asturiennes à viande. L information des livres généalogiques de 2 races asturiennes a été analysée pour connaitre leur structure génétique. Une division des troupeaux en 3 groupes est réalisée en fonction de utilisation des taureaux. Les intervalles entre generations s elevent à 5 3 ans chez la race Casina et 5 4 ans chez la Carrenana et dans les 2 cas les males en service sont plus jeunes que les femelles. La determination des troupeaux les plus importants montre la contribution de la region du Caso 60 à I ensemble des troupeaux apparaissant en race Casina. Le coefficient de consanguinité moyen total de Wright est de 0 7 pour la Casina et de 0 24 pour la Carrenana. Les taux très bas d augmentation de la consanguinité peuvent en partie s expliquer par une centralisation relativement
