StacksVerified U.S. regulatory reference

21 CFR §558.363

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Specifications. Type A medicated articles containing 36, 45, 54, 72, or 90 grams narasin per pound.
  2. (b)Sponsor. See No. 058198 in § 510.600(c) of this chapter.
  3. (c)Tolerances. See § 556.428 of this chapter.
  4. (d)Special considerations. An expiration date of 2 months (8 weeks) is required for narasin Type C medicated swine feeds.
  5. (e)Conditions of use. It is used as follows:
    1. (1)Chickens—
    2. (2)Swine—
    3. (3)Narasin single-ingredient Type A medicated articles may also be used in combination with:
      1. (i)Avilamycin as in § 558.68.
      2. (ii)[Reserved]