CFR › Title 21 › Part 556 › §556.38021 CFR §556.380Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)[Reserved](b)Tolerances. The tolerance for melengestrol is:(1)Cattle. Fat: 25 ppb.(2)[Reserved](c)Related conditions of use. See § 558.342 of this chapter.