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The efficacy of Ivermectin at 2004 g/kg was evaluated in two groups of indigenous sheep of Mazandaran (Zel Bred) naturally infected with B.trigonocephalum. Tichostrongylus spp., Haemonchus contortus and trichuris spp. According to feacal egg count, the number of eggs per gram of faeces (E.P.G) fall to zero in treated groups within 72 hours. The autopsy was done in animals of both groups after 7 days of treatment. There was no evidence of nematods in treated groups but there was few in untreated one.
This study indicates Ivermectin was 100% effective against adult statge of the abovementioned species.