CFR›Title 21›Chapter I›Part 501 ContainsSubparts A–FCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 501—ANIMAL FOOD LABELING Subparts A Subpart A—General Provisions Sections 501.1–501.18 B Subpart B—Specific Animal Food Labeling Requirements Section 501.22 C-E Subparts C-E [Reserved] F Subpart F—Exemptions From Animal Food Labeling Requirements Sections 501.100–501.110 Authority15 U.S.C. 1453, 1454, 1455; 21 U.S.C. 321, 331, 342, 343, 348, 371.Source41 FR 38619, Sept. 10, 1976, unless otherwise noted. Previous 500 Part 500—General Next 502 Part 502—Common or Usual Names for Nonstandardized Animal Foods