Animal Drugs, Feeds, and Related Products; Melengestrol Acetate

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The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of 12 supplemental new animal drug applications (NADA's) filed by The Upjohn Co. The applications concern the use of Type A medicated articles containing melengestrol acetate (MGA) (alone and in combination) to manufacture certain combination drug Type B and Type C medicated feeds for heifers fed in confinement for slaughter. The supplements provide for a revised tolerance of 25 parts per billion (ppb) MGA residues, which is a change in the regulation of medicated feed applications to a Category I drug, and the removal of the requirement for a 48-hour preslaughter withdrawal period.