Abstract
Although some argument is still ongoing about the resistance to different anthelmintics, there is a general agreement that reversion to susceptibility is rare once drug resistance (DR) has developed in livestock helminths, even when other drugs with completely different working mechanisms are used for prolonged periods. Some in vitro methods have been used to investigate the efficacy of towards nematode parasite: larval development (LD), larval migration inhibition (LMI), larval feeding inhibition (LFI) and egg hatch (EH) assays (Amarante et al. , 1997; Coles et al., 1988). The aim of this work was to determine the potential inhibitory effect of condensed tannins or other bioactive compounds from Acacia molissima extract on the feeding of first stage larvae of Haemonchus contortus, Trichostrongylus vitrinus and Teladorsagia circumcincta, using the LFI test.
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