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Infections by gastrointestinal helminth parasites of livestock are among the most common and economically important diseases of grazing livestock. They are characterized by lowering outputs of animal products (meat, milk, hides and skins), manure and traction (Perry et al., 2002). In the Developed world, with the exception of those countries in the southern hemisphere, the greatest impact is probably the costs of control, particularly in the case of the helminth parasitoses. In the Developing world, the greatest impact of parasitic diseases is attributed to the potential productivity losses. In addition, there are highly pathogenic nematode (Haemonchus spp), and trematode (Fasciola spp) of ruminants which are also capable of causing acute disease and high mortality (Githiori, 2004). Haemonchus contortus is one of the top 10 constraints of sheep and goat production in East Africa.

Alternative Control Methods of Gastrointestinal Nematode Infections in Small Ruminants: Biological Method and Use of Medicinal Plant Extracts