Control of gastro-intestinal nematodes and productivity responses of grazing cattle treated with a two-dose program of doramectin of ivermectin - Gennari, Solange Maria; Kasai, Nobuko; Caproni Júnior, Lauro; Umehara, Ossamuro; Gonçalves, Lineu C. B.; Derozier, Christophe (Congresso Mundial de Buiatria, 2000)