# Implantation or Injectable Dosage Form New Animal Drugs; Trenbolone and Estradiol; Technical Amendment
> **Food and Drug Administration** · Final rule; technical amendment. · Published 2003-09-23 · Effective 2003-09-23 · 68 FR 55199
## Document
- **Document number:** 03-24161
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 68 FR 55199
- **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 steers for increased rate of weight gain and improved feed efficiency. This section of the regulations is also being amended to remove a redundant description of another strength implant. This action is being taken to improve the accuracy of the regulations.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/09/23/03-24161/implantation-or-injectable-dosage-form-new-animal-drugs-trenbolone-and-estradiol-technical-amendment)
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