REDR2002 Reproduction in Domestic Ruminants V Genes Controlling Reproductive Performance (4 abstracts)
Prolificacy genes in sheep: the French genetic programmes
P Mulsant 1 , F Lccerf 1 , S Fabre 2 , L Bodin 3 , J Thimonier 4 , P Monget 2 , I Lanneluc 1 , D Monniaux 2 , J Teyssier 4 & J-M Elsen 3
1INRA, Laboratoire de Génétique Cellulaire, BP 27, 31326 Castanet-Tolosan, France; 2INRA, Phvsiologie de la Reproduction et des Comportements, UMR 6073 INRA-CNRS-Université François Rabelais, 37380 Nouzilly, France; 3INRA, Station d'Amélioration Génétique des Animaux, BP 27, 31326 Castanet-Tolosan, France; and 4UMR INRA – ENSAM – CIRAD, Elevage des Ruminants en Régions Chaudes, 2 place Viala, 34060 Montpellier Cedex 02, France
It has been demonstrated that variations in litter size or ovulation rate in different breeds of sheep can be associated with the segregation of several major genes. This set of natural mutants constitutes a valuable resource to determine key points in the biochemical pathways controlling the development of ovarian follicles. The French genetic programmes were devised to identify two of these genes: the Booroola (FecB) and Lacaune genes. The FecB prolific mutation corresponds to a non-conservative mutation (Q249R) in the intracellular kinase-signalling domain of the bone morphogenetic protein receptor type IB (BMPR-IB) gene. The Lacaune gene is situated on ovine chromosome 11. Positional cloning is currently in progress to identify the relevant gene and mutation. A similar approach, limited to linkage testing of candidate genes, is proposed to classify the different prolificacy genes in sheep.
© 2003 Society for Reproduction and Fertility
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