Sheep and goat nematode resistance to anthelmintics: pro and cons among breeding management factors Anne Silvestre, Vincent Leignel, Boumadiane Berrag, Nadine Gasnier, Jean-François Humbert, Christophe Chartier and Jacques Cabaret Vet. Res., 33 5 (2002) 465-480 DOI: 10.1051/vetres:2002033