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 Code of Federal Regulations (Last Updated: July 5, 2024)
 Title 21 - Food and Drugs
 Chapter I - Food and Drug Administration, Department of Health and Human Services
 SubChapter E - Animal Drugs, Feeds, and Related Products
 Part 556 - Tolerances for Residues of New Animal Drugs in Food
 Subpart B - Specific Tolerances for Residues of New Animal Drugs

  § 556.283 - Florfenicol.  

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  • § 556.283 Florfenicol.

    (a) Acceptable daily intake (ADI). The ADI for total residues residue of florfenicol is 10 micrograms per kilogram µg/kg of body weight per day.

    (b) Tolerances -

    (

    . The tolerances for florfenicol amine (marker residue) are:

    (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) Catfish. Muscle (target tissue): 1 ppm.

    (4) Freshwater-reared warmwater finfish (other than catfish) and salmonids.

    The tolerance for florfenicol amine (the marker residue) in muscle

    Muscle/skin (

    the

    target

    tissues

    tissue)

    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.

    [76 FR 16291, Mar. 23, 2011, as amended at 81 FR 17608, Mar. 30, 2016]