Control of gastro-intestinal nematodes and productivity responses of grazing cattle treated with a two-dose program of doramectin or ivermectin - Gennari, Solange Maria; Kasai, Nobuko; Caproni Junior, L; Umehara, O; Gonçalves, L. C. B; Derozier, C (Revista Brasileira de Parasitologia Veterinária, 2000)