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A atuação dos anti-helmínticos à base de ivermectin (0,2mg/kg), levamisole (10mg/kg), closantel (10mg/kg) e albendazole (10mg/kg), foi avaliada em 65 rebanhos ovinos do estado de Santa Catarina, Brasil. As avaliações foram executadas quando o rebanho apresentava-se com o lote controle acima de 500 ovos por grama de fezes (OPG) da ordem Strongylida, acompanhado do cultivo de larvas. Foram aleatoriamente formados quatro grupos de 10 animais, identificados e tratados com os respectivos anti-helmínticos. Sete a 10 dias após, foram coletadas amostras de fezes dos animais de cada grupo para a verificação do OPG e identificação das larvas e os resultados comparados com o do lote controle. Considerou-se resistência quando a eficácia da droga foi menor do que 95% e o intervalo de confiança, menor do que 90%. Dos 65 rebanhos avaliados, a resistência ao ivermectin esteve presente em 77%, sendo somente identificadas larvas de Haemonchus (100%), ao albendazole em 65%, sendo Haemonchus (74%), Ostertagia (15%) e Trichostrongylus (11%), ao closantel em 13%, sendo Haemonchus (100%) e em 15% ao levamisole sendo Trichostrongylus (44%), Ostertagia (39%) e Haemonchus (17%). Conclui-se que a multi-resistência está presente na maioria do rebanho ovino catarinense. Sixty-five sheep flocks were studied in Santa Catarina State to determine parasites resistance to anthelmintics based on ivermectin (0.2mg/kg), levamisole (10mg/kg), closantel (10mg/kg) and albendazole (10 mg/kg). The evaluation was carryed out when a particular sheep flock showed a control group with EPG (eggs per gram) level above 500. Larvae culture was also performed to allow the parasite identification. Four randomized groups of 10 animals were formed and treated with one of the four anthelmintic products. Faecal samples were collected of each group seven to ten days after the treatment, aiming to perform the eggs count and larvae identification. These results were compared with results of the control group. The anthelmintics were considered to present evidence of parasite resistance when the efficacy of the product was lower than 95%. From the total of 65 sheep flock studied, seventy-seven percent presented parasite resistance to ivermectin, with Haemonchus larvae only (100%); sixty-five percent to albendazole, with Haemonchus (74%), Ostertagia (15%) and Trichostrongylus (11%); thirteen percent to closantel, with Haemonchus (100%); and fifteen percent to levamisole, with Thichostrongylus (44%), Ostertagia (39%) and Haemonchus (17%). The results detected the presence of a multi-resistance to anthelminthics in the great majority of the sheep flocks of Santa Catarina State

Resistência de parasitos gastrintestinais de ovinos a alguns anti-helmínticos no estado de Santa Catarina, Brasil