Federal Register Final rule: FDA is amending the animal drug regulations to reflect approval of a Pharmacia & Upjohn Co. supplemental NADA that provides for using the same dose levels approved for single-ingredient Type C medicated feeds containing melengestrol acetate, monensin, or tylosin phosphate for heifers fed in confinement for slaughter in three-way, combination drug Type C medicated feeds containing melengestrol acetate, monensin, and tylosin phosphate. To view this final rule, click here.