Implantation or Injectable Dosage Form New Animal Drugs; Estradiol and Testosterone, Progesterone and Estradiol, Trenbolone, and Trenbolone and Estradiol, With Tylosin

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The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of four supplemental applications filed by Ivy Laboratories, Div. of Ivy Animal Health, Inc., two supplemental new animal drug applications (NADA's) and two supplemental abbreviated new animal drug applications (ANADA's). The supplemental applications provide for addition of tylosin as a local antibacterial to estradiol/testosterone, progesterone/estradiol, trenbolone, and trenbolone/estradiol cattle ear implants. The products are subcutaneous implants for cattle for weight gain and/or feed efficiency.