21 CFR § 558.78 - Bacitracin zinc.
---
identifier: "/us/cfr/t21/s558.78"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 558.78 - Bacitracin zinc."
title_number: 21
title_name: "Food and Drugs"
section_number: "558.78"
section_name: "Bacitracin zinc."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "E"
subchapter_name: "ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS"
part_number: "558"
part_name: "NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 354, 360b, 360ccc, 360ccc-1, 371."
regulatory_source: "40 FR 13959, Mar. 27, 1975, unless otherwise noted."
cfr_part: "558"
---
# 558.78 Bacitracin zinc.
(a) *Specifications.* Type A medicated articles containing bacitracin zinc equivalent to 10, 25, 40, or 50 grams per pound bacitracin.
(b) *Sponsor.* See No. 054771 in § 510.600(c) of this chapter.
(c) *Related tolerances.* See § 556.70 of this chapter.
(d) *Conditions of use.* (1) It is used as follows:
| Bacitracin zinc in grams per ton | Combinations in grams per ton | Indications for use | Limitations | Sponsor |
| --- | --- | --- | --- | --- |
| (i) 4 to 50 | | Chickens: for increased rate of weight gain and improved feed efficiency | Growing chickens | 054771 |
| (ii) 4 to 50 | | Turkeys and pheasants: for increased rate of weight gain and improved feed efficiency | Growing turkeys and pheasants | 054771 |
| (iii) 5 to 20 | | Quail; for increased rate of weight gain and improved feed efficiency | Growing quail; feed as the Type C feed to starting quail through 5 weeks of age | 054771 |
| (iv) 10 to 25 | | Laying chickens; improved feed efficiency and increased egg production | | 054771 |
| (v) 10 to 50 | | Swine; increased rate of weight gain and improved feed efficiency | Growing and finishing swine | 054771 |
| (vi) 20 | | Growing-finishing swine; increased rate of weight gain | In Type C feed | 054771 |
| (vii) 20 to 40 | | Growing-finishing swine; improved feed efficiency | ......do | 054771 |
(2) It is used in feed for growing cattle at 35 to 70 milligrams per head per day as follows:
(i) To aid in stimulating growth and improving feed efficiency.
(ii) For increased rate of weight gain and improved feed efficiency; see sponsor 054771.
(3) Bacitracin zinc may also be used in combination with:
(i) Amprolium and ethopabate as in § 558.58.
(ii) Clopidol as in § 558.175.
(iii) Decoquinate as in § 558.195.
(iv) Lasalocid as in § 558.311.
(v) Monensin as in § 558.355.
(vi) Naracin as in § 558.363.
(vii) Nicarbazin as in § 558.366.
(viii) Robenidine as in § 558.515.
(ix) Salinomycin as in § 558.550.
[41 FR 10994, Mar. 15, 1976]
For citations affecting § 558.78, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at