Home
gpo.gov
govinfo.gov

e-CFR Navigation Aids

Browse

Simple Search

Advanced Search

 — Boolean

 — Proximity

 

Search History

Search Tips

Corrections

Latest Updates

User Info

FAQs

Agency List

Incorporation By Reference

eCFR logo

Related Resources

Electronic Code of Federal Regulations

We invite you to try out our new beta eCFR site at https://ecfr.federalregister.gov. We have made big changes to make the eCFR easier to use. Be sure to leave feedback using the Feedback button on the bottom right of each page!

e-CFR data is current as of February 25, 2021

Title 21Chapter ISubchapter EPart 556Subpart B → §556.283


Title 21: Food and Drugs
PART 556—TOLERANCES FOR RESIDUES OF NEW ANIMAL DRUGS IN FOOD
Subpart B—Specific Tolerances for Residues of Approved and Conditionally Approved New Animal Drugs


§556.283   Florfenicol.

(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.

Need assistance?