comparison of anthelmintic control programs for sheep in virginia.haemonchus contortus is the most serious parasitic problem encountered by sheep producers in southwestern virginia. four anthelmintic control programs for grazing lambs were tested. group tr received monthly sc injections of ivermectin (200 micrograms/kg of body weight). group si received the same dose of ivermectin at 0, 3, 6, 9, and 12 weeks after the start of the grazing season. group sl was given levamisole (8 mg/kg, po) 0, 3, 6, 9, and 12 weeks after the start of the grazing season, and gro ...19921506250
multiple anthelmintic resistance in a goat herd.anthelmintic resistance was monitored over a 30 month period within a goat herd in eastern virginia, usa. resistance to ivermectin, levamisole and benzimidazole drugs was detected in haemonchus contortus using the fecal egg count reduction test (fecrt). when levamisole use was discontinued for 1 year, susceptibility to levamisole appeared to return. although a single treatment with fenbendazole was able to reduce fecal egg counts by only 50%, two doses administered in a 12 h interval increased e ...200010622608
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