Evaluation of the efficacy of fenbendazole and ivermectin against small strongyles in horses in Northeastern Corrientes (Argentina)
Intestinal nematodes in horses represent a significant threat to equine health and the profitability of the horse production system. The periodic administration of anthelmintics is the most used method to control these infections. However, the continuous and indiscriminate use of these drugs without...
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| Formato: | Artículo revista |
| Lenguaje: | Español |
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Universidad Nacional del Nordeste
2025
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| Acceso en línea: | https://revistas.unne.edu.ar/index.php/vet/article/view/8126 |
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| Sumario: | Intestinal nematodes in horses represent a significant threat to equine health and the profitability of the horse production system. The periodic administration of anthelmintics is the most used method to control these infections. However, the continuous and indiscriminate use of these drugs without considering the parasites epidemiological characteristics or performing prior diagnosis contributes to the development of anthelmintic resistance. Resistance of small strongyles to anthelmintics has been well documented for decades in various countries, including Argentina. The aim of this study was to assess the efficacy of the active ingredients fenbendazole and ivermectin against small strongyles in horses from Santo Tomé and Ituzaingó, Corrientes (Argentina), using the fecal egg count reduction test (FECRT) following the new guidelines established by the World Association for the Advancement of Veterinary Parasitology (WAAVP). The study was conducted during 2023 and 2024. Horses from five different owners were included. To evaluate resistance, statistical analysis software (available at http://www.fecrt.com) implementing the FECRT protocol was used. This software compares the average fecal egg counts before and after treatment for each of the compounds studied. Four trials were conducted on 45 horses treated with fenbendazole, and four on 42 horses treated with ivermectin. Resistance to fenbendazole was detected in all four trials, with efficacy rates below 90%. In one of the ivermectin trials, although the fecal egg count reduction was insufficient (less than 90.9%), a second test was recommended before confirming resistance to this compound. |
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