New Animal Drugs for Use in Animal Feeds; Melengestrol

The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of several supplemental applications filed by Pharmacia and Upjohn Co. to their new animal drug applications (NADAs) for the use of single-ingredient Type A medicated articles containing melengestrol acetate, monensin, and tylosin to make two-way and (with tylosin) three-way, dry and liquid, combination drug Type C medicated feeds for heifers fed in confinement for slaughter. Some of the supplemental NADAs add the single-ingredient monensin claim for prevention and control of coccidiosis in feedlot heifers to the indications for combinations of melengestrol acetate and monensin with and without tylosin. Other supplemental NADAs extend the dose of tylosin to the single-ingredient range of 60 to 90 milligrams (mg) per head per day to reduce the incidence of liver abscesses in feedlot heifers and provide for use of liquid Type C medicated feeds containing melengestrol acetate and tylosin with and without monensin.