# New Animal Drugs for Use in Animal Feeds; Chlortetracycline
> **Food and Drug Administration** · Final rule. · Published 1998-11-27 · Effective 1998-11-27 · 63 FR 65554
## Document
- **Document number:** 98-31572
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 63 FR 65554
- **CFR reference:** 21 CFR 558
- **Publication date:** 1998-11-27
- **Effective date:** 1998-11-27
## 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 Roche Vitamins, Inc. The supplemental NADA provides for a zero-day withdrawal period for use of 500 grams per ton (g/t) chlortetracycline (CTC) Type C medicated chicken feeds.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/11/27/98-31572/new-animal-drugs-for-use-in-animal-feeds-chlortetracycline)
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