# Zilpaterol.
**AGENCY:**
Food and Drug Administration, HHS.
**ACTION:**
Final rule.
**SUMMARY:**
The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of a new animal drug application (NADA) filed by Intervet, Inc. The NADA provides for use of approved, single-ingredient zilpaterol hydrochloride and monensin U.S.P. Type A medicated articles to make two-way combination Type B and Type C medicated feeds for cattle fed in confinement for slaughter.
**DATES:**
This rule is effective March 18, 2008.
**FOR FURTHER INFORMATION CONTACT:**
Gerald L. Rushin, Center for Veterinary Medicine (HFV-126), Food and Drug Administration, 7500 Standish Pl., Rockville, MD 20855, 240-276-8103, e-mail: *[email protected]* .
**SUPPLEMENTARY INFORMATION:**
Intervet, Inc., P.O. Box 318, 29160 Intervet Lane, Millsboro, DE 19966, filed NADA 141-278 that provides for use of ZILMAX (zilpaterol hydrochloride) and RUMENSIN (monensin U.S.P.) Type A medicated articles to make dry and liquid, two-way combination Type B and Type C medicated feeds used for increased rate of weight gain, improved feed efficiency, and increased carcass leanness; and for prevention and control of coccidiosis due to *Eimeria bovis* and *E. zuernii* in cattle fed in confinement for slaughter during the last 20 to 40 days on feed. The NADA is approved as of February 15, 2008, and the regulations in 21 CFR 558.665 are amended to reflect the approval.
In accordance with the freedom of information provisions of 21 CFR part 20 and 21 CFR 514.11(e)(2)(ii), a summary of safety and effectiveness data and information submitted to support approval of this application may be seen in the Division of Dockets Management (HFA-305), Food and Drug Administration, 5630 Fishers Lane, rm. 1061, Rockville, MD 20852, between 9 a.m. and 4 p.m., Monday through Friday.
The agency has determined under 21 CFR 25.33(a)(2) that this action is of a type that does not individually or cumulatively have a significant effect on the human environment. Therefore, neither an environmental assessment nor environmental impact statement is required.
This rule does not meet the definition of “rule” in 5 U.S.C. 804(3)(A) because it is a rule of “particular applicability.” Therefore, it is not subject to the congressional review requirements in 5 U.S.C. 801-808.
**List of Subjects in 21 CFR Part 558**
Animal drugs, Animal feeds.
**21 CFR Part 558**
Therefore, under the Federal Food, Drug, and Cosmetic Act and under the authority delegated to the Commissioner of Food and Drugs and redelegated to the Center for Veterinary Medicine, 21 CFR part 558 is amended as follows:
**PART 558—NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS**
**21 CFR Part 558**
1. The authority citation for 21 CFR part 558 continues to read as follows:
**Authority:**
21 U.S.C. 360b, 371.
**21 CFR Part 558**
2. In § 558.665, add paragraph (e)(3) to read as follows:
§ 558.665
(e) * * *
| Zilpaterol in grams/ton | Combination in grams/ton | Indications for use | Limitations | Sponsor |
| --- | --- | --- | --- | --- |
| * * * * * * * | | | | |
| (3) 6.8 to provide 60 to 90 mg/head/day | Monensin 10 to 40 | Cattle fed in confinement for slaughter: As in paragraph (e)(1) of this section; and for prevention and control of coccidiosis due to
and
. | As in paragraph (e)(1) of this section; see paragraph § 558.355(d) of this chapter. Monensin as provided by No. 000986 in § 510.600(c) of this chapter. | 057926 |
| * * * * * * * | | | | |
Dated: March 6, 2008.
Bernadette Dunham,
Director, Center for Veterinary Medicine.