# Implantation or Injectable Dosage Form New Animal Drugs; Trenbolone and Estradiol
> **Food and Drug Administration** · Final rule. · Published 2003-09-23 · Effective 2003-09-23 · 68 FR 55200
## Document
- **Document number:** 03-24157
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 68 FR 55200
- **CFR reference:** 21 CFR 522
- **Publication date:** 2003-09-23
- **Effective date:** 2003-09-23
## Abstract

The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of a supplemental abbreviated new animal drug application (ANADA) filed by Ivy Laboratories, Division of Ivy Animal Health, Inc. The supplemental ANADA provides for an additional dose of trenbolone acetate and estradiol implant for use in feedlot heifers for increased rate of weight gain.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/09/23/03-24157/implantation-or-injectable-dosage-form-new-animal-drugs-trenbolone-and-estradiol)
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