Inoculation of lactating ewes by the intramammary route with Mycoplasma agalactiae: comparative pathogenicity of six field strains Richard Sanchis, Georgette Abadie, Maurice Lambert, Evelyne Cabasse, Philippe Dufour, Jean-Michel Guibert and Michel Pépin Vet. Res., 31 3 (2000) 329-337 DOI: 10.1051/vetres:2000104