---
kind: "section"
citation: "21 C.F.R. § 556.420"
title: "21"
number: "556.420"
heading: "Monensin."
url: "https://uscodex.org/cfr/21/556.420"
---

# §556.420. Monensin.

- (a) **Acceptable daily intake (ADI).** The ADI for total residue of monensin is 12.5 µg/kg of body weight per day.
- (b) **Tolerances.** The tolerances for monensin are:
  - (1) **Cattle.**
    - (i) **Liver—** 0.10 ppm.
    - (ii) **Muscle, kidney, and fat—** 0.05 ppm.
    - (iii) **Milk—** Not required.
  - (2) **Chickens and turkeys.** Edible tissues (excluding eggs): Not required.
  - (3) **Goats.** Edible tissues (excluding milk): 0.05 ppm.
  - (4) **Quail.** Edible tissues (excluding eggs): Not required.
- (c) **Related conditions of use.** See [§ 558.355](/cfr/21/558.355.md) of this chapter.

## Notes

### Authority

Authority: 21 U.S.C. 342, 360b, 371.

### Source

Source: 84 FR 32993, July 11, 2019, unless otherwise noted.