Free Access
Genet. Sel. Evol.
Volume 37, Number Suppl. 1, 2005
International Workshop on Major Genes and QTL in Sheep and Goats
Page(s) S109 - S123
Genet. Sel. Evol. 37 (2005) S109-S123
DOI: 10.1051/gse:2004033

Mapping quantitative trait loci for milk production and genetic polymorphisms of milk proteins in dairy sheep

Francis Barilleta, Juan-José Arranzb and Antonello Cartac

a  Station d'amélioration des animaux, Institut national de la recherche agronomique, BP 27, 31326 Castanet-Tolosan Cedex, France
b  Universidad de Leon, Departamento de Produccion Animal, 24071 Leon, Spain
c  Istituto Zootecnico e Caseario per la Sardegna, 07040 Olmedo, Italy

(Accepted: 5 October 2004)

Abstract -
In this paper, we present recent advances in the molecular dissection of complex traits in dairy sheep and discuss their possible impact on breeding schemes. In the first step, we review the literature data on genetic polymorphisms and the effects of sheep ${\alpha_{\text{s1}}}$-casein and $\beta$-lactoglobulin loci. It is concluded that the results are rather inconsistent and cannot be used in dairy sheep selection. In a second step, we describe the strategy implemented in France, Italy and Spain taking advantage of the genetic maps for QTL detection. These studies were part of a European project, called "genesheepsafety", which investigated both milk production and functional traits. Preliminary QTL results are presented for production traits.

Key words: dairy sheep / milk proteins / genetic polymorphisms / QTL / milk production

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© INRA, EDP Sciences 2004