21 CFR 556.283

§ 556.283 Florfenicol.

United States · 21 CFR — Food and Drugs · Status: effective

Cite this

Citation: 21 CFR 556.283, § 556.283 Florfenicol, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/87770
Permanent ID: ys:prov:87770@1
SHA-256: a5c0faf0916d98478b6f1f40dad7c21cf60b97ea9e44e3b6a6da2e5c01fa1040

The hash is SHA-256 of this version's text, with every run of whitespace collapsed to a single space and the ends trimmed. The ID always leads back here, and checking it says whether the text you cited is still the current version.

Full text

(a) Acceptable daily intake (ADI). The ADI for total residue of florfenicol is 10 µg/kg of body weight per day. (b) Tolerances. The tolerances for florfenicol amine (marker residue) are: (1) Cattle. (i) Liver (target tissue): 3.7 ppm. (ii) Muscle: 0.3 ppm. (2) Swine. (i) Liver (target tissue): 2.5 ppm. (ii) Muscle: 0.2 ppm. (3) Catfish. Muscle (target tissue): 1 ppm. (4) Freshwater-reared warmwater finfish (other than catfish) and salmonids. Muscle/skin (target tissue): 1 ppm. (c) Related conditions of use. See §§ 520.955, 522.955, 522.956, and 558.261 of this chapter.

Legislative history

This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.