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Validation of QTL affecting resistance to nematodes in sheep identified in a back-cross design in a pure breed population

Thursday, August 21, 2014
Posters (The Westin Bayshore)
Carole R. Moreno , INRA, UMR1388 GenPhySE, Castanet-Tolosan, France
Philippe Jacquiet , UMT Santé des petits ruminants, Toulouse, France
Frederic Bouvier , INRA de Bourges la Sapinière, Bourges, France
Jacques Cortet , Université François Rabelais de Tours, Tours, France
Alexandra Blanchard-Letort , Université François Rabelais de Tours, Tours, France
Fabrice Guégnard , Université François Rabelais de Tours, Tours, France
Dominique Francois , INRA GenPhySE UMR1388, Toulouse, France
Yves Bourdillon , INRA de Bourges la Sapinière, Bourges, France
Christelle Grisez , UMT Santé des petits ruminants, Toulouse, France
Françoise Prevot , UMT Santé des petits ruminants, Toulouse, France
Audrey Averadère , UMT Santé des petits ruminants, Toulouse, France
Julie Demars , INRA GenPhySE UMR1388, Toulouse, France
Julien Sarry , INRA GenPhySE UMR1388, Toulouse, France
Alessandra Stella , Fondazione Parco Tecnologico Padano, Lodi, Italy
Florent Woloszyn , INRA GenPhySE UMR1388, Toulouse, France
Kamila Canale-Tabet , INRA GenPhySE UMR1388, Toulouse, France
Jacques Cabaret , Université François Rabelais de Tours, Tours, France
Gwenola Tosser-Klopp , INRA, UMR1388 GenPhySE, Castanet-Tolosan, France
Guillaume Salle , Université François Rabelais de Tours, Tours, France
Abstract Text: Gastro-intestinal nematodes are of major concern to sheep health worldwide. Identifying the causative genes responsible for resistance would augment the efficiency of selection. Previously, back-cross (BC) sheep (Black Belly * Romane breeds) were genotyped with a 50K SNP chip and were measured for faecal egg count after two successive experimental challenges by H. contortus. The most significant QTL were identified on chromosomes 5, 12, 13, 21. A customized assay including 1000 SNP was created to increase the density of marker coverage in these regions and others major QTL regions affecting parasitism resistance in natural infection conditions. In the present study, 277 Romane lambs were experimentally challenged with H contortus and genotyped with the dedicated 1000 SNP. Six out of the eight tested QTL regions have an effect in the Romane pure Breed population.

 

Keywords: Nematode Resistance Sheep SNP