Implantation or Injectable Dosage Form New Animal Drugs; Trenbolone and Estradiol

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The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of two supplemental new animal drug applications (NADA's) filed by Hoechst Roussel Vet. The supplemental NADA's provide for use of two additional trenbolone acetate and estradiol ear implants, one for heifers fed in confinement for slaughter for increased rate of weight gain, and the other for steers fed in confinement for slaughter for increased rate of weight gain and improved feed efficiency.