Strategic control of gastrointestinal nematode and lungworm infections with eprinomectin at turnout and eight weeks later

Two groups of 10 first-year grazing cattle were either left untreated as co ntrols (group 1) or treated with eprinomectin as a pour-on application at t urnout and eight weeks later (group 2). The control group developed a mild infection with gastrointestinal nematodes and lungworms during the season, wheares the treated animals remained healthy. The interval between the trea tments allowed the establishment of adult worms, but the egg counts remaine d negligible. The total number of eggs shed by the treated cattle during th e grazing season was significantly smaller than by the controls.