§558.363. Narasin.

21 C.F.R. § 558.363

(a)

Specifications. Type A medicated articles containing 36, 45, 54, 72, or 90 grams narasin per pound.

(b)

Sponsor. See No. 058198 in § 510.600(c) of this chapter.

(c)

Tolerances. See § 556.428 of this chapter.

(d)

Special considerations. An expiration date of 2 months (8 weeks) is required for narasin Type C medicated swine feeds.

(e)

Conditions of use. It is used as follows:

(1)

Chickens—

(2)

Swine—

(3)

Narasin single-ingredient Type A medicated articles may also be used in combination with:

(i)

Avilamycin as in § 558.68.

(ii)

[Reserved]

Notes, amendments, and revision history

[83 FR 64741, Dec. 18, 2018, as amended at 86 FR 14825, Mar. 19, 2021; 91 FR 20345, Apr. 16, 2026]

Authority: 21 U.S.C. 354, 360b, 360ccc, 360ccc-1, 371.

Source: 40 FR 13959, Mar. 27, 1975, unless otherwise noted.

[83 FR 64741, Dec. 18, 2018, as amended at 86 FR 14825, Mar. 19, 2021; 91 FR 20345, Apr. 16, 2026]