. However, grazing can have detrimental
effects on goats' health status caused by uncontrolled parasitic diseases.
The control of parasites has been achieved over the past fifty
years with the use of anthelmintic drugs; to meet public concern
and to stimulate a sustainable agriculture, a number of in vivo experiments
with bioactive plants able to reduce parasite population have
been carried out, even if very few studies addressed the immunological
mechanisms implicated in the host responses, and with inconsistent
results