Extensive rearing hinders Maedi-Visna Virus (MVV) infection in sheepIratxe Leginagoikoa, Ramón A. Juste, Jesse Barandika, Beatriz Amorena, Damián De Andrés, Luis Luján, Juan Badiola and Eduardo BerriatuaVet. Res., 37 6 (2006) 767-778DOI: https://doi.org/10.1051/vetres:2006034