Federal Register Final rule: FDA is amending the animal drug regulations to more accurately reflect the recent approval (10/09) of two Pharmacia & Upjohn supplemental NADAs that provided for increased levels of monensin in two-way Type C medicated feeds containing melengestrol acetate and monensin, and in three-way Type C medicated feeds containing melengestrol acetate, monensin, and tylosin phosphate for heifers fed in confinement for slaughter. To view this final rule, click here.