United States of America. The Food and Drug Administration has approved the combined use of narasin and nicarbazin (1:1 fixed ratio) together with bacitracin methylene disalicylate, in medicated feed for broiler chickens to prevent coccidiosis caused by Eimeria necatrix, E.tenella, E.acervulina, E.brunetti, E.mivati and E.maxima and for increased rate of weight gain and improved feed efficiency. The feeds contain 27 to 45 g of narasin and nicarbazin and 4 to 50 g/t of bacitracin methylene disalicylate.
Reference: Federal Register 64(21): 4965 (1999).
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