# Implantation or Injectable Dosage Form New Animal Drugs; Trenbolone and Estradiol
> **Food and Drug Administration** · Final rule. · Published 2000-07-26 · Effective 2000-07-26 · 65 FR 45878
## Document
- **Document number:** 00-18822
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 65 FR 45878
- **CFR reference:** 21 CFR 522
- **Publication date:** 2000-07-26
- **Effective date:** 2000-07-26
## Abstract

The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of two supplemental new animal drug applications (NADA's) filed by Hoechst Roussel Vet. The supplemental NADA's provide for use of two additional trenbolone acetate and estradiol ear implants, one for heifers fed in confinement for slaughter for increased rate of weight gain, and the other for steers fed in confinement for slaughter for increased rate of weight gain and improved feed efficiency.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/07/26/00-18822/implantation-or-injectable-dosage-form-new-animal-drugs-trenbolone-and-estradiol)
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