# Implantation or Injectable Dosage Form New Animal Drugs; Progesterone and Estradiol Benzoate
> **US Department of Health and Human Services** · Final rule. · Published 1997-02-25 · Effective 1997-02-25 · 62 FR 8371
## Document
- **Document number:** 97-4517
- **Category:** other
- **Sub-agency:** US Department of Health and Human Services
- **Federal Register citation:** 62 FR 8371
- **CFR reference:** 21 CFR 522
- **Publication date:** 1997-02-25
- **Effective date:** 1997-02-25
## Abstract

The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of a supplemental new animal drug application (NADA) filed by Ivy Laboratories, Inc. The supplemental NADA provides for use of a progesterone-estradiol benzoate ear implant in suckling beef heifer calves for increased rate of weight gain.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/02/25/97-4517/implantation-or-injectable-dosage-form-new-animal-drugs-progesterone-and-estradiol-benzoate)
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