ANTHELMINTIC RESISTANCE ON SHEEP FLOCKS FROM ASSOCIATION OF THE MUNICIPALITIES OF THE ALTO IRANI REGION (AMAI), WEST OF SANTA CATARINA STATE, BRAZIL
DOI:
https://doi.org/10.5216/cab.v8i3.1733Keywords:
Parasitos, resistência a drogas, OvinosAbstract
In order to know the situation of the anthelmintic resistance in sheep farms in the municipalities of Asso-ciation of the municipalities of the High Irani Region - AMAI, West of Santa Catarina State, Brazil, nine flocks were submitted to the faecal egg counts reduction test (FECRT). This test consists in comparing the mean FEC of a group of sheep, 14 days after treatment with the mean FEC of a non-treated control group. Only drugs that could reduce FEC up to 95% were considered effective. The mo-lecules used were: levamisole (7.5 mg/kg), closantel (7.5 mg/Kg), albendazole (10 and 5 mg/Kg), ivermectin and moxidectin (0.2 mg/Kg). It was detected resistance of the gastrointestinal nematodes to all the anthelmintics tested. One hundred percent of the farms showed resistance to the ivermectin, 66.7% to the moxidectin, 44.4% to levamisole e 75% to albendazole. To the macrocyclic lactones and al-bendazol, both Haemonchus sp. and Trichostrongylus sp. were resistant. To levamisole, resistance is restricted to the genus Trichostrongylus. It was also detected one population of Haemonchus sp. resistant to Closantel and one of Nematodirus sp. resistant to albendazole. These data show the urgency to spread means of integrated control of para-sites, with the objective to enlarge the life of the few drugs that remain effective.
KEY-WORDS: Anthelmintic resistance, Santa Catarina, SHEEP.
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