StacksVerified U.S. regulatory reference

21 CFR §556.240

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)[Reserved]
  2. (b)Residues. Residues of estradiol are not permitted in excess of the following increments above the concentrations of estradiol naturally present in untreated animals:
    1. (1)Cattle.
      1. (i)Muscle: 0.2 ppb.
      2. (ii)Liver: 0.6 ppb.
      3. (iii)Kidney: 1.2 ppb.
      4. (iv)Fat: 1.2 ppb.
    2. (2)[Reserved]
  3. (c)Related conditions of use. See §§ 522.840, 522.850, 522.1940, 522.2343, 522.2477, and 522.2478 of this chapter.