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Title: Prevalencia y factores asociados a la resistencia a antihelmínticos en ganaderías ovinas de Aragón
Other Titles: Prevalence and associated factors in anthelmintic resistance in sheep flocks of Aragon
Authors: Calavia Benito, Rebeca
Ferrer Mayayo, Luis Miguel
Ramos Antón, J.J.
Lacasta Lozano, Delia
Uriarte Abad, Joaquín
Calvete Margolles, Carlos
Issue Date: 2011
Citation: Calavia, R., Ferrer, L.M., Ramos, J.J., Lacasta, D., Uriarte, J., Calvete, C. “Prevalencia y factores asociados a la resistencia a antihelmínticos en ganaderías ovinas de Aragón”. En: 41 Jornadas de Estudio. XIV Jornadas sobre Producción Animal. AIDA. Zaragoza, España, 17 y 18 de mayo de 2011, pp.762-764. ISBN: 978-84-615-0062-8
Abstract: A survey to determine the level of flock resistance to benzimidazoles (BZ) was performed under field conditions in 107 commercial sheep farms from Aragon region (NE Spain). Resistance was measured using the in vitro egg hatch assay (EHA) in the simplified form of discriminant dose. Management and environmental variables were compiled from each flock and their relationships with resistance levels analyzed in a multivariate approach Estimated prevalence of resistant flocks was 11% although presence of BZ resistant parasite strains was suspected in 98% of samples. Frequency of deworming, grazing in private pastures and subdosification were management variables positively related to resistance levels whereas using benzimidazoles only was negatively, probably because they were substituted by other anthelmintic groups in flocks where reduced BZ efficacy was suspected. Different uses of soil in addition to climatic conditions and seasonality were environmental variables associated with observed resistance levels.
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