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