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The control of gastrointestinal nematode infections in sheep and the present status of anthelmintic resistance in sheep

Autor Rojo Vázquez, Francisco Antonio ; Martínez Valladares, María
Fecha de publicación 2013
EditorSociedad Española de Parasitología
Citación XVIII Congreso de la Sociedad Española de Parasitología. Encuentro Internacional de Parasitología de España, Francia, Italia y Portugal : 35 (2013)
ResumenThe infection of sheep by GIN causes low growth rates, a reduction in milk production and, in some occasions, the death of the affected animals. The prevalence of sheep GIN infections has been increasing in the last years as a consequence of the development of AR. The development of AR is the result of the inadequate use of anthelmintics. Besides the recent introduction into the market of two newanthelmintic classes that are a temporary solution to GIN control, the problem would continue if the use of anthelmintics is unadequate. In order to know the evolution of the AR status since the earliest reports in Spain, we carried out a study between 2006 and 2011 to update the AR status in sheep flocks infected by GIN and compared the results with those obtained some years ago in the same area between 1999 and 2003. As in previous studies, the sampling area was mainly flocks located in the province of León (Castilla y León). The flocks tested were selected when the mean number of FEC in a flock was >150, in which case the in vivo FECRT was carried out. In flocks with a mean FEC of <150 epg, then other techniques were used for BZ (EHA) of LEV and IVM (LFIA). The present study shows that AR was in 63.6% of flocks, independently of the anthelmintic used. The higher values were those for LEV (59.0%), followed by IVM (27.3%) and ABZ (13.6%). Multidrug-resistance was found in 27.2% of theflocks (one flock was resistant to the three anthelmintic families, including LA-MOX). When comparing the situation of AR between 1999-2011 and 2006-2011, the resistance to BZs and MLs remain fairly constant by means of the FECRT. However, resistance to LEV was lower during 19992003 (38.5%) than during 2006-2011. In conclusion, the AR status in NW Spain remains constant to BZ and ML since 1999, but has increased to LEV. Also increased the prevalence of multidrug-resistant and one flock was resistant to the three anthelmintic families (including MOX). By means of LFIA and EHA higher results were obtained for BZs but the results should be interpreted with caution due to false positives.
Descripción Trabajo presentado al: XVIII Congreso de la Sociedad Española de Parasitología. Encuentro Internacional de Parasitología de España, Francia, Italia y Portugal (Gran Canaria, 17-20 septiembre, 2013).
Versión del editorhttp://www.seoc.eu/site/es/libros-de-actas-publicaciones
URI http://hdl.handle.net/10261/97886
Aparece en las colecciones: (IGM) Comunicaciones congresos
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