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New Animal Drugs for Use in Animal Feeds; Melengestrol; Monensin

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Food and Drug Administration, HHS.


Final rule.


The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of a supplemental abbreviated new animal drug application (ANADA) filed by Ivy Laboratories, Division of Ivy Animal Health, Inc. The supplemental ANADA provides for use of increased dose levels of melengestrol acetate and monensin in two-way, combination drug Type C medicated feeds for heifers fed in confinement for slaughter.


This rule is effective September 30, 2011.

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John K. Harshman, Center for Veterinary Medicine (HFV-170), Food and Drug Administration, 7500 Standish Pl., Rockville, MD 20855, 240-276-8197, e-mail:

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Ivy Laboratories, Division of Ivy Animal Health, Inc., 8857 Bond St., Overland Park, KS 66214, filed a supplement to ANADA 200-422 for use of HEIFERMAX 500 (melengestrol acetate) and RUMENSIN (monensin, USP) single-ingredient Type A medicated articles to make two-way, combination drug Type C medicated feeds for heifers fed in confinement for slaughter. The supplemental ANADA provides for use of increased dose levels of melengestrol acetate and monensin. The supplemental application is approved as of July 1, 2011, and the regulations in 21 CFR 558.342 are amended to reflect the approval and minor revisions.

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 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 an 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.

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List of Subjects in 21 CFR Part 558

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Therefore, under the Federal Food, Drug, and Cosmetic Act and under 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:

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1. The authority citation for

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

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2. In § 558.342, in the table in paragraph (e)(1), remove and reserve paragraphs (e)(1)(v) and (e)(1)(vi); in paragraph (e)(1)(x), in the “Sponsor” column, add “021641”; and revise paragraph (d)(2) to read as follows:

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(d) * * *

(2) A physically stable melengestrol acetate liquid Type B or C feed will not be subject to the requirements for mixing directions prescribed in paragraph (d)(1) of this section provided it has a pH of 4.0 to 8.0 and contains a suspending agent(s) sufficient to maintain a viscosity of not less than 300 centipoises per second for 3 months.

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Dated: September 20, 2011.

Steven D. Vaughn,

Director, Office of New Animal Drug Evaluation, Center for Veterinary Medicine.

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[FR Doc. 2011-25220 Filed 9-29-11; 8:45 am]