Anthelmintic resistance in Creole horses in the South of Rio Grande do Sul, Brazil

ABSTRACT The objective of the study was to evaluate antiparasitic resistance against horse nematodes in South Rio Grande do Sul, Brazil. results concerning tests anthelmintic efficacy on horses, stored database Parasitic Diseases Study Group (GEEP) - Veterinary Faculty, at Federal University Pelotas (UFPel), were carried out laboratory from 2018 2019. Stool samples received farms with breeding adult female and male Criollo horses naturally infected, located municipalities country’s southern region. agents tested Triclorfon + Fenbendazole, Closantel Albendazole, Ivermectin Praziquantel, Ivermectin, Doramectin, Mebendazole Moxidectin. Techniques such as Gordon Whitlock, Coproculture Fecal Egg Count Reduction Test performed. Of all drugs tested, it observed that only treatments 2% showed desired values. indicate macrocyclic lactones is usual equine parasites this Brazilian region, despite isolated Ivermectin.