21 C.F.R. § 556.600 – Spectinomycin.

(a) Acceptable daily intake (ADI). The ADI for total residue of spectinomycin is 25 µg/kg of body weight per day.
(b) Tolerances. The tolerances for spectinomycin are:
1. (1) Cattle.
  1. (i) Kidney (target tissue): 4 ppm spectinomycin (marker residue).
  2. (ii) Muscle: 0.25 ppm.
2. (2) Chickens and turkeys. Edible tissues (excluding eggs): 0.1 ppm.
3. (3) Swine. Edible tissues: Not required.
(c) Related conditions of use. See §§ 520.1265, 520.2123b, 520.2123c, 522.2120, and 522.2121 of this chapter.