In countries as France, Italy or Spain, dairy sheep have been efficiently selected on milk traits. Last decade, important efforts in research and extension have concentrated on selection of new traits, as milkability, resistance to mastitis or longevity of the animals, for which the economic importance has increased rapidly in the last years. To face these new goal, on-going researches are combining classical quantitative approaches and QTL detection. Indeed QTL information could be particularly appropriate for traits difficult or expensive to measure. Therefore two complementary QTL detection projects have been implemented in France and Italy : one based on crossbreeding between Sarda and Lacaune breeds in an experimental flock in Sardinia with numerous phenotypic measurements combined with a genome scan (Carta et al., 2002), and the other based on purebred granddaughter families of French dairy sheep breeds (Barillet, 1999). In a first step, seven chromosomal regions previously associated in dairy cattle with milk production traits or somatic cell score (SCS) were tested in 13 granddaughter French dairy sheep families. The purpose of this paper is to present preliminary results of this limited QTL detection project.

L. Schibler, A. Roig, A. Neau, Y. Amigues, M. Y Boscher, E. P Cribiu, Didier Boichard, R. Rupp, Francis Barillet

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 1, , 1.41, 2002
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