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21 CFR §556.540

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)[Reserved]
  2. (b)Residues. Residues of progesterone are not permitted in excess of the following increments above the concentrations of progesterone naturally present in untreated animals:
    1. (1)Cattle and sheep.
      1. (i)Muscle: 5 ppb.
      2. (ii)Liver: 15 ppb.
      3. (iii)Kidney: 30 ppb.
      4. (iv)Fat: 30 ppb.
    2. (2)[Reserved]
  3. (c)Related conditions of use. See §§ 522.1940 and 529.1940 of this chapter.