A study was set out to investigate the distribution of gastrointestinal nematode parasites in sheep farms of Hassan district, Karnataka and to ascertain which species are involved in the anthelmintic resistance. In the study 26 farms were treated with fenbendazole and 19 farms were treated with ivermectin. The pre and post treatment faecal cultures were prepared for each farms. | Morphological and molecular characterization of gastrointestinal nematodes in sheep