subchapter_subject: "ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS"
part_code: "556"
part_subject: "TOLERANCES FOR RESIDUES OF NEW ANIMAL DRUGS IN FOOD"
subpart_code: "B"
subpart_subject: "Specific Tolerances for Residues of New Animal Drugs"
section_number: "556.283"
section_subject: "Florfenicol."
cfr_reference: "21 CFR 556.283"
title_name: "Title 21"
title_subject: "Food and Drugs"
parts_covered: "Parts 500 to 599"
revised_date: "Revised as of April 1, 2019"
publication_date: "As of April 1, 2019"
contains_description: "Containing a codification of documents of general applicability and future effect"
publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"
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(a)Acceptable daily intake (ADI). The ADI for total residues of florfenicol is 10 micrograms per kilogram of body weight per day.
(b)Tolerances—(1) Cattle—(i) Liver (the target tissue). The tolerance for florfenicol amine (the marker residue) is 3.7 parts per million (ppm).
(ii)Muscle. The tolerance for florfenicol amine (the marker residue) is 0.3 ppm.
(2)Swine—(i) Liver (the target tissue). The tolerance for parent florfenicol (the marker residue) is 2.5 ppm.
(ii)Muscle. The tolerance for parent florfenicol (the marker residue) is 0.2 ppm.
(3)Freshwater-reared finfish (other than catfish) and salmonids. The tolerance for florfenicol amine (the marker residue) in muscle/skin (the target tissues) is 1 ppm.
(4)Catfish. The tolerance for florfenicol amine (the marker residue) in muscle (the target tissues) is 1 ppm.
(c)Related conditions of use. See §§ 520.955, 522.955, 522.956, and 558.261 of this chapter.