Emergence of Anthelmintic Resistance in Haemonchus contortus on Organized Sheep and Goat Farms of Sub-Himalayan Region of Northern India

In India, small ruminants contribute in providing economic security to small, landless and marginal farmers. Parasitic diseases are important cause of production losses in small ruminants the world over. Of these, gastrointestinal (GI) nematodosis is a common parasitic infection of small ruminants in India including sub-Himalyan region of northern India (Yadav et al., 2009). It is caused by mixed infections of GI nematodes. Among the various GI nematodes, Haemonchus contortus is the predominant parasite found throughout the year and is considered as the most pathogenic GI nematode responsible for impaired productivity in small ruminants throughout the world (Khalafalla et al., 2011).