After a century of research into
their biology and control, this parasite continues to
be an important constraint on ruminant production.
Modern anthelmintics, together with an
understanding of the morphology and epidemiology
of parasitism, the immune response and nutritional
requirements of ruminants, currently enable
satisfactory management of the problem. However,
the increasing incidence of resistance by the parasite
to available anthelmintics is challenging task for
producers to maintain high levels of productivity in
livestock industry.