Prevalencia y factores asociados a la resistencia a antihelmínticos en ganaderías ovinas de Aragón
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Date
2011
Authors
Calavia Benito, RebecaFerrer Mayayo, Luis Miguel
Ramos Antón, J.J.
Lacasta Lozano, Delia
Uriarte Abad, Joaquín
Calvete Margolles, Carlos
Journal Title
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conferenceObjectAbstract
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.
Description
Keywords
Anthelmintic, Resistance, Benzimidazoles, Sheep
Bibliographic 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
Other field subjects
AntihelmínticosEnfermedades parasitarias
Ovinos
Producción y sanidad animal