However, in the majority of cases, the anthelmintic activity of plants has been found to be lower than that reported for synthetic anthelmintics. Although this might not necessarily be a problem,
criteria should be established in order to evaluate whether the anthelmintic activity is
adequate to ensure that animals do not compromise their health and growth as a result of parasitism (Githiori et al., 2006).
Plants with moderate anthelmintic activity should still be considered. While they may not be useful as a sole alternative to anthelmintic drugs, theymaystill be valuable as part of an integrated approach specifically designed to achieve sustainable parasite control in ruminant production systems. The role of plants in extending the use and increasing efficacy of commercial existing anthelmintics should be explored, particularly in plants that might help in reversing resistance (Githiori et al., 2006).