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Harkers Harkamectin Liquid. Harkamectin is a single treatment that helps to control worms, lice and mites in racing and show pigeons. It is advisable to treat pigeons before the racing season and at any point should a problem with worms, mites or lice become apparent.Should not be used on birds less than 8 weeks of age. Should not be used during the molting period or during the hatching period. Should not be used on pigeons less then 400gAvailable in a 5ml bottle (sufficient for 50 birds). Place two drops per bird onto the skin, under the feathers between the shoulders.Contains lvermectin 0.35% w/v