# New Animal Drugs for Use in Animal Feeds; Melengestrol Acetate, Monensin, and Tylosin
> **US Department of Health and Human Services** · Final rule. · Published 1997-02-25 · Effective 1997-02-25 · 62 FR 8372
## Document
- **Document number:** 97-4514
- **Category:** other
- **Sub-agency:** US Department of Health and Human Services
- **Federal Register citation:** 62 FR 8372
- **CFR reference:** 21 CFR 558
- **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 Pharmacia & Upjohn Co. The supplement provides for the use of separately approved Type A medicated articles containing melengestrol acetate (dry form only), monensin, and tylosin to manufacture certain combination drug, dry, meal Type B medicated feeds for use in making Type C medicated feeds. The feeds are for heifers fed in confinement for slaughter for increased rate of weight gain, improved feed efficiency, suppression of estrus, and reduced incidence of liver abscesses.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/02/25/97-4514/new-animal-drugs-for-use-in-animal-feeds-melengestrol-acetate-monensin-and-tylosin)
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