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Abstract
The efficacy of an ivermectin jetting fluid against the sheep body louse, Bovicola (Damalinia) ovis, in long-woolled sheep was investigated in three field trials. In all trials, louse populations in hand-jetted sheep were reduced to non- detectable numbers within 2 weeks of treatment. By comoarison, shorn and unshorn control sheep maintained detectable infestations for the duration of the trials.