# Implantation or Injectable Dosage Form New Animal Drugs; Trenbolone and Estradiol
> **Food and Drug Administration** · Final rule. · Published 2007-03-01 · Effective 2007-03-01 · 72 FR 9243
## Document
- **Document number:** E7-3620
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 72 FR 9243
- **CFR reference:** 21 CFR 522
- **Publication date:** 2007-03-01
- **Effective date:** 2007-03-01
## 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 the addition of tylosin tartrate to an approved subcutaneous implant containing trenbolone and estradiol used for increased rate of weight gain and improved feed efficiency in steers and heifers fed in confinement for slaughter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/03/01/E7-3620/implantation-or-injectable-dosage-form-new-animal-drugs-trenbolone-and-estradiol)
---
*AI Analytics · CC0 1.0*