Studies on the efficacy of pyrantel for the control of small strongyles in equines in central Argentina
DOI:
https://doi.org/10.14409/favecv.2023.22.e0024Keywords:
horses, cyathostomins, pyrantel, resistance, ArgentinaAbstract
The objective of this study was to investigate the prevalence of resistance to pyrantel pamoate in 11 horse farms (111 horses) from the central area of Argentina using the Fecal Egg Count Reduction Test (FECRT) and a hierarchical Bayesian model for data analysis. The same methodology was applied on week 4 post treatment to detect possible shortening in the ERP. The general efficacy of pyrantel was considered adequate in 9/11 farms, resistant in one and suspicious on other, and no changes were observed in the ERP. In the elimination of eggs before treatment (n= 127), 23.7 % of the animals were considered low eliminators, 32.5 % as moderate eliminators and 43.8 % as high eliminators, emphasizing the possibility of selectively treating the latter. Selective treatments would allow preserving the useful life of this drug, as well as that of the macrocyclic lactones, and represent a more rational alternative (compared to current mass treatments) for the sustainable control of small strongyles in adult horses. In the pre-treatment stool cultures, small strongyles were the parasitic group mostly observed but the presence of Strongylus vulgaris was discovered in three of the 11 farms studied, which warrants future research to determine the prevalence of this parasite of recognized pathogenicity. Key words: horses, cyathostomins, pyrantel, resistance, Argentina.
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