# Implantation or Injectable Dosage Form New Animal Drugs; Trenbolone Acetate and Estradiol
> **Food and Drug Administration** · Final rule. · Published 1997-05-27 · Effective 1997-05-27 · 62 FR 28629
## Document
- **Document number:** 97-13820
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 62 FR 28629
- **CFR reference:** 21 CFR 522
- **Publication date:** 1997-05-27
- **Effective date:** 1997-05-27
## Abstract

The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of an abbreviated new animal drug application (ANADA) filed by Ivy Laboratories, Inc. The ANADA provides for the use of trenbolone acetate and estradiol implants for increased rate of weight gain and improved feed efficiency in feedlot steers.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/05/27/97-13820/implantation-or-injectable-dosage-form-new-animal-drugs-trenbolone-acetate-and-estradiol)
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