---
kind: "unit"
title: "21"
title_heading: "Food and Drugs"
key: "chI/subchE/part558"
level: "part"
label: "Part 558"
heading: "New Animal Drugs for Use in Animal Feeds"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/21/chI-subchE-part558"
sections_count: 63
---

# Part 558 — New Animal Drugs for Use in Animal Feeds

Title 21 C.F.R. — Food and Drugs › Chapter I — Food and Drug Administration, Department of Health and Human Services › Subchapter E — Animal Drugs, Feeds, and Related Products

## Contents

- [Subpart A — General Provisions](/cfr/21/chI-subchE-part558-subpartA.md)
- [Subpart B — Specific New Animal Drugs for Use in Animal Feeds](/cfr/21/chI-subchE-part558-subpartB.md)