U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 28, 2025

All TitlesTitle 21Chapter IPart 558 - PART 558—NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS
Subpart A [§ 558.3 - § 558.6] - Subpart A—General Provisions
Subpart B [§ 558.55 - § 558.680] - Subpart B—Specific New Animal Drugs for Use in Animal Feeds
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