# New Animal Drugs for Use in Animal Feed; Category Definitions
> **Food and Drug Administration** · Direct final rule. · Published 2016-08-24 · Effective 2016-12-01 · 81 FR 57796
## Document
- **Document number:** 2016-20148
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 81 FR 57796
- **CFR reference:** 21 CFR 558
- **Publication date:** 2016-08-24
- **Effective date:** 2016-12-01
- **HHS docket:** Docket No. FDA-2016-N-1896
## Abstract

The Food and Drug Administration (FDA, the Agency, we) is amending the animal drug regulations by revising the definitions of the two categories of new animal drugs used in medicated feeds to base category assignment only on approved uses in major animal species. This revision will preserve the availability of medicated feeds intended for therapeutic use in minor animal species and prevent a significant disincentive for future development of additional minor species therapies.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/08/24/2016-20148/new-animal-drugs-for-use-in-animal-feed-category-definitions)
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