Chlortetracycline.
21 C.F.R. § 556.150
in effectEffective: 2024-07-01(a) Acceptable daily intake (ADI). The ADI for total residue of tetracyclines including chlortetracycline, oxytetracycline, and tetracycline is 25 µg/kg of body weight per day.
(b) Tolerances. The tolerances for the sum of tetracycline residues are:
(1) Cattle. (i) Liver: 6 ppm.
(ii) Kidney and fat: 12 ppm.
(iii) Muscle: 2 ppm.
(2) Chickens, turkeys, and ducks. (i) Liver: 6 ppm.
(ii) Kidney and fat: 12 ppm.
(iii) Muscle: 2 ppm.
(iv) Eggs: 0.4 ppm for chlortetracycline only.
(3) Sheep. (i) Liver: 6 ppm.
(ii) Kidney and fat: 12 ppm.
(iii) Muscle: 2 ppm.
(4) Swine. (i) Liver: 6 ppm.
(ii) Kidney and fat: 12 ppm.
(iii) Muscle: 2 ppm.
(c) Related conditions of use. See §§ 520.441, 520.443, 520.445, 558.128, and 558.140 of this chapter.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-21.xmlFetched: 7/26/2026