21 CFR Parts 500-599 covers animal drug products, dosages, animal food labeling, animal drug applications, and more. Code of Federal Regulations Title 21, Volume 6, April 1, 2015 Containing parts Parts 500 to 599 Part 500; GENERAL Part 501; ANIMAL FOOD LABELING Part 502; COMMON OR USUAL NAMES FOR NONSTANDARDIZED ANIMAL FOODS Part 509; UNAVOIDABLE CONTAMINANTS IN ANIMAL FOOD AND FOOD-PACKAGING MATERIAL Part 510; NEW ANIMAL DRUGS Part 511; NEW ANIMAL DRUGS FOR INVESTIGATIONAL USE Part 514; NEW ANIMAL DRUG APPLICATIONS Part 515; MEDICATED FEED MILL LICENSE Part 516; NEW ANIMAL DRUGS FOR MINOR USE AND MINOR SPECIES Part 520; ORAL DOSAGE FORM NEW ANIMAL DRUGS Part 522; IMPLANTATION OR INJECTABLE DOSAGE FORM NEW ANIMAL DRUGS Part 524; OPHTHALMIC AND TOPICAL DOSAGE FORM NEW ANIMAL DRUGS Part 526; INTRAMAMMARY DOSAGE FORM NEW ANIMAL DRUGS Part 528; NEW ANIMAL DRUGS IN GENETICALLY ENGINEERED ANIMALS Part 529; CERTAIN OTHER DOSAGE FORM NEW ANIMAL DRUGS Part 530; EXTRALABEL DRUG USE IN ANIMALS Part 556; TOLERANCES FOR RESIDUES OF NEW ANIMAL DRUGS IN FOOD Part 558; NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS Part 564; Reserved Part 570; FOOD ADDITIVES Part 571; FOOD ADDITIVE PETITIONS Part 573; FOOD ADDITIVES PERMITTED IN FEED AND DRINKING WATER OF ANIMALS Part 579; IRRADIATION IN THE PRODUCTION, PROCESSING, AND HANDLING OF ANIMAL FEED AND PET FOOD Part 582; SUBSTANCES GENERALLY RECOGNIZED AS SAFE Part 584; FOOD SUBSTANCES AFFIRMED AS GENERALLY RECOGNIZED AS SAFE IN FEED AND DRINKING WATER OF ANIMALS Part 589; SUBSTANCES PROHIBITED FROM USE IN ANIMAL FOOD OR FEED Parts 590-599; Reserved