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Effects of tannins in goats infected with gastrointestinal nematodes

Published online by Cambridge University Press:  27 February 2018

V. Paolini  and
H. Hoste
V. Paolini*
Affiliation:
Unité Mixte de Recherches 1225 INRA/DGER. Ecole Nationale Vétérinaire de Toulouse. 23, chemin des Capelles F31076, Toulouse. France
H. Hoste
Affiliation:
Unité Mixte de Recherches 1225 INRA/DGER. Ecole Nationale Vétérinaire de Toulouse. 23, chemin des Capelles F31076, Toulouse. France
*
1Corresponding author: V.Paolini E-mail:v.paolini@envt.fr
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Summary

Infections of the gastrointestinal tract with nematodes remains one of the main pathological constraints associated with outdoor breeding of goats both in temperate and tropical areas. The usual mode of control of these parasitic infections is based on the repeated use of chemical anthelmintics, but the prevalence and diffusion of anthelmintic resistances in nematode populations is particularly high in goats, and the sustainability of the system is now questioned. Therefore, there is a deep interest to seek and explore alternative solutions to chemotherapy. Among those, tannins and tanniferous plants represent one of the most promising options. However, information on the effects of these polyphenolic compounds on nematode infection in goats is far less abundant than in sheep. This review presents data obtained from both outdoor and indoor studies aiming at examining the relationship between the consumption of tannins or tanniferous plants, particularly those composing the vegetation of rangeland and the resistance and resilience of goats to trichostrongyle infections. Results from in vitro studies with extracts from different plants which are grazed or browsed by goats are also discussed in relation with the possible mechanisms of action of tannin in goats. These results are compared to those acquired in sheep and are discussed in relation with the physiological adaptation of goats to tannin consumption. Further research perspectives and possible applications for the control of nematode infections in goats are also briefly evoked.

Resumen

Resumen

Las infecciones por nematodos del tracto gastrointestinal permanecen como uno de los principales problemas de salud asociados a la produccion de cabras en condiciones de pastoreo en zonas templadas y tropicales. La forma usual de control de estas infecciones parasitarias se basa en el uso repetido de antihelminticos. Sin embargo, la prevalencia y difusion de la resistencia antihelmintica en las poblaciones de nematodos es particularmente alta en cabras y la sostenibilidad del sistema de produccion es ahora puesta en duda. Por lo tanto, hay un gran interes en buscar y explorar soluciones alternativas a la quimioterapia. Entre estas, los taninos y las plantas taniferas representan una de las opciones mas prometedoras. Sin embargo, la informacion de los efectos de estos conpuestos fenolicos sobre las infecciones de nematodos en cabras son mucho menos comunes que en ovinos. Esta revision presenta datos obtenidos de estudios de campo y de laboratorio realizados con el objetivo de examinar la relacion entre el consumo de taninos o plantas taniferas, particularmente de aquellas que forman parte de la vegetacion de agostaderos, y la tolerancia y resistencia de caprinos contra infecciones por trichostrongylidos. Los resultados de estudios in vitro utilizando extractos de diferentes plantas que son pastoreadas o ramoneadas por las cabras se discuten tambien en relacion con el posible mecanismo de accion de los taninos en los caprinos. Estos resultados son comparados con resultados en ovinos y se discuten en relacion de las adaptaciones fisiologicas de los caprinos al consumo de taninos. Las prospectivas de nuevos estudios y las posibles aplicaciones para el control de infecciones por nematodos en cabras son tambien incluidas brevemente.

Type
Posters
Information
BSAP Occasional Publication , Volume 34: Herbivores: Assessment of intake, digestibility and the roles of secondary compounds , 2006 , pp. 209 - 220
Copyright
Copyright © British Society of Animal Science 2006

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