EFICÁCIA DE FORMULAÇÕES ANTI-HELMÍNTICAS COMERCIAIS EM EQUINOS NO MUNICÍPIO DE DOURADINA, PARANÁ

• Main Authors: Fernando de Almeida Borges, Aguinaldo Yoshio Nakamura, Gabriel Daltoé de Almeida, Victor Hugo Araujo Cadamuro
• Format: Article
• Language: English
• Published: Universidade Federal de Goiás 2010-10-01
• Series: Ciência Animal Brasileira
• Subjects: Anthelmintics; horse; nematode; resistance.
• Online Access: http://www.revistas.ufg.br/index.php/vet/article/view/5492/7929
• ISSN: 1518-2797; 1089-6891

The aim of this study was to evaluate the efficacy of commercial anthelmintics in horses. From three farms in the municipality of Douradina, PR, Brazil, a total of 51 cross-breed horses, male and female, from different ages was selected. The animals were naturally infected by gastrointestinal nematodes and submitted to treatment with (I) oral solution of closantel (10mg/kg), (II) paste containing oxifendazole (2.5mg/kg) + triclorfon (40mg/kg) or (III) gel containing ivermectin (200mcg/kg) + praziquantel (2,5mg/kg) + vitamin E (1mg/kg). Due to the limited number of available horses at farm B, only treatments II and III were used and only treatment III was used at farm C. EPG counts and coprocultures were carried out before and seven days after the treatment. Treatment I showed 68.78% efficacy, while treatment II showed efficacy of 72.74% and 92.11% at the two evaluated farms. Treatment III showed 100% efficacy at the three farms. The coprocultures indicated that the nematode that survived to the treatment belonged to the Cyathostominae sub-family. Therefore, the lack of resistance to ivermectin and the reduced efficacy of closantel and of the association of oxifendazole + triclorfon against cyathostomes, the most common nematode in horses in Brazil, was demonstrated.