Survey of anthelmintic treatment with oxfendazole, ivermectin and levamisole in sheep flocks

Abstract

The trial was carried out in nine different farms in the State of São Paulo to verify the effect of anthelmintic treatment with oxfendazole, levamisole and ivermectin in gastrointestinal nematode parasites in sheep. In each farm, the sheeps were randomly allocated in four groups: the first group was treated with oxfendazole at 4,5 mg/kg; the second one with levamisole at 7,5 mg/kg; the third one with ivermectin at 0,2 mg/kg and the fourth one was the untreated control. Faecal samples were collected from animals on the day of the treatment and seven days after that. After the treatment with oxfendazole, levamisole and ivermectin, significant reductions in nematode egg counts were verified in two, four and five farms, respectively. Haemonchus spp and Tnchostrongylus spp were the most prevalent parasites in the trial. The results suggest the occurrence of parasites with multiple anthelmintic resistance in the majority of the farms.