---
kind: "section"
citation: "21 C.F.R. § 522.2476"
title: "21"
number: "522.2476"
heading: "Trenbolone acetate."
url: "https://uscodex.org/cfr/21/522.2476"
---

# §522.2476. Trenbolone acetate.

- (a) **Sponsors.** See sponsors in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter for use as in [paragraph (d)](#d) of this section.
  - (1) **No.** 000061 for use as in paragraphs [(d)(1)(i)(A)](#d-1-i-A), (d)(1)(ii) and (iii), [(d)(2)(i)(A)](#d-2-i-A), and (d)(2)(ii) and (iii) of this section.
  - (2) **No.** 058198 for use as in [paragraph (d)](#d) of this section.
- (b) **Related tolerances.** See [§ 556.739](/cfr/21/556.739.md) of this chapter.
- (c) **Special considerations.** Labeling of implants described in paragraph [(d)(1)(i)(B)](#d-1-i-B) and [(d)(2)(i)(B)](#d-2-i-B) of this section shall bear the following: “Federal law restricts this drug to use by or on the order of a licensed veterinarian.”.
- (d) **Conditions of use—**
  - (1) **Steers fed in confinement for slaughter—**
    - (i) **Amount.** Use 126 days prior to slaughter; should be reimplanted once after 63 days.
      - (A) 140 milligrams (mg) trenbolone acetate (one implant consisting of 7 pellets, each pellet containing 20 mg trenbolone acetate) per implant dose.
      - (B) 140 mg trenbolone acetate (one implant consisting of 8 pellets, each of 7 pellets containing 20 milligrams trenbolone acetate, and 1 pellet containing 29 mg tylosin tartrate) per implant dose.
    - (ii) **Indications for use.** For improved feed efficiency.
    - (iii) **Limitations.** Implant subcutaneously in ear only. Do not use in animals intended for subsequent breeding or in dairy animals. Safety and effectiveness have not been established in veal calves. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal.
  - (2) **Heifers fed in confinement for slaughter—**
    - (i) **Amount.** Use last 63 days prior to slaughter.
      - (A) 200 mg trenbolone acetate (one implant consisting of 10 pellets, each pellet containing 20 mg trenbolone acetate) per implant dose.
      - (B) 200 mg of trenbolone acetate (one implant consisting of 11 pellets, each of 10 pellets containing 20 mg of trenbolone acetate, and 1 pellet containing 29 mg of tylosin tartrate) per implant dose.
    - (ii) **Indications for use.** For increased rate of weight gain and improved feed efficiency.
    - (iii) **Limitations.** Implant subcutaneously in ear only. Do not use in animals intended for subsequent breeding or in dairy animals. Safety and effectiveness have not been established in veal calves. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal.

## Notes

### Amendments

[66 FR 47961, Sept. 17, 2001, as amended at 69 FR 70056, Dec. 2, 2004; 74 FR 61517, Nov. 25, 2009; 81 FR 48703, July 26, 2016; 88 FR 55566, Aug. 16, 2023]

### Authority

Authority: 21 U.S.C. 360b.

### Source

Source: 40 FR 13858, Mar. 27, 1975, unless otherwise noted.

### Amendments

[66 FR 47961, Sept. 17, 2001, as amended at 69 FR 70056, Dec. 2, 2004; 74 FR 61517, Nov. 25, 2009; 81 FR 48703, July 26, 2016; 88 FR 55566, Aug. 16, 2023]