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Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Segregation of a major gene influencing ovulation in progeny of Lacaune meat sheep | 447 Genet Sei. Evol. 34 2002 447-464 INRA EDP Sciences 2002 DOI 10.1051 gse 2002017 Original article Segregation of a major gene influencing ovulation in progeny of Lacaune meat sheep Loys Bodina Magali SanCristobalb Frédéric Lecerfb Philippe Mulsantb Bernard Bibéc Daniel Lajousa Jean-Pierre Bellocd Francis Eychenne Yves Amiguesf Jean-Michel Elsena a Station d amelioration génétique des animaux Institut national de la recherche agronomique BP 27 31326 Castanet-Tolosan France b Laboratoire de génétique cellulaire Institut national de la recherche agronomique BP 27 31326 Castanet-Tolosan France c Departement de génétique animale Institut national de la recherche agronomique BP 27 31326 Castanet-Tolosan France d Cooperative OVI-TEST Route d Espalion 12850 Onet-le-Château France e Domaine experimental de Langlade 31450 Montgiscard France F Labogena Domaine de Vilvert 78352 Jouy-en-Josas France Received 17 September 2001 accepted 13 February 2002 Abstract - Inheritance of the ovulation rate OR in the Lacaune meat breed was studied through records from a small nucleus of 36 hyper-prolific ewes screened on farms on the basis of their natural litter size and from progeny data of three selected Lacaune sires. These sires were chosen at the Al centre according to their breeding values estimated for the mean and the variability of their daughters litter size. Non-carrier Lacaune dairy ewes were inseminated to produce 121 Fl daughters and 27 Fl sons. Twelve sons four from each sire were used in turn to inseminate non-carrier Lacaune dairy ewes providing 260 BC progeny ewes. Fl and BC progeny were brought from private farms and gathered after weaning on an experimental farm where ovulation rates were recorded in the first and second breeding seasons. With an average of 6.5 records each the mean OR of hyper-prolific ewes was very high 5.34 and 38.4 of records showed a rate of 6 or more. Fl data showed high repeatability of OR r 0.54 within ewe with significant variability among
