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Báo cáo sinh học: " Genetic variability of six French meat sheep breeds in relation to their genetic management"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Genetic variability of six French meat sheep breeds in relation to their genetic management | 637 Genet Sei. Evol. 35 2003 637-655 INRA EDP Sciences 2003 DOI 10.1051 gse 2003044 Original article Genetic variabilitY of six French meat sheep breeds in relation to their genetic management Marie Hubya Laurent Griffona Sophie Moureauxa b Hubert De Rochambeauc Coralie Danchin-Burgea Étienne Verrierd a Institut de l Elevage Departement de génétique 149 rue de BercY 75495 Paris Cedex 12 France b Station de génétique quantitative et appliquée Institut national de la recherche agronomique 78352 JouY-en-Josas Cedex France c Station d amelioration génétique des animaux Institut national de la recherche agronomique BP 27 31326 Castanet-Tolosan Cedex France d UMR Génétique et diversite animales Institut national de la recherche agronomique Institut national agronomique Paris-Grignon 16 rue Claude Bernard 75231 Paris Cedex 05 France Received 18 November 2002 accepted 16 June 2003 Abstract - Some demographic parameters the genetic structure and the evolution of the genetic variability of six French meat sheep breeds were analysed in relation with their management. Four of these breeds are submitted to more or less intense selection the Berrichon du Cher BCH Blanc du Massif Central BMC Charollais CHA and Limousin LIM the other two breeds are under conservation the Roussin de La Hague RLH and Solognot SOL . Genealogical data of the recorded animals born from 1970 to 2000 and of their known ancestors were used. The most balanced contributions of the different flocks to the sire-daughter path was found in the SOL. In the BCH a single flock provided 43 of the sire-AI sire path whereas the contributions of the flocks were more balanced in the BMC and LIM the only other breeds where AI is used to a substantial amount . The distribution of the expected genetic contribution of the founder animals was found to be unbalanced especially in the BCH and LIM. The effective numbers of ancestors founders or not for the ewes born from 1996 to 2000 were equal to 35 BCH 144 BMC 112 CHA 69 LIM