Title 21: Food and Drugs
« Home / Title 21 - Food and Drugs--Volume 6 / CHAPTER I - FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) / SUBCHAPTER E - ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS
/ PART 558 - NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS
/ Subpart B - Specific New Animal Drugs for Use in Animal Feeds / § 558.635 Virginiamycin.
§ 558.635 Virginiamycin.
(a) Specifications. Type A medicated articles containing 10, 20, 50, or 227 grams virginiamycin per pound.
(b) Sponsors. See No. 066104 in § 510.600(c) of this chapter.
(c) Related tolerances. See § 556.750 of this chapter.
(d) Special considerations. (1) Federal law restricts medicated feed containing this veterinary feed directive (VFD) drug to use by or on the order of a licensed veterinarian. See § 558.6 for additional requirements.
(2) The expiration date of VFDs for virginiamycin medicated feeds must not exceed 6 months from the date of issuance. VFDs for virginiamycin shall not be refilled.
(3) Not for use in breeding swine over 120 pounds.
(4) Dilute Type A article with at least 10 pounds of a feed ingredient prior to final mixing in 1 ton of Type C feed.
(e) Conditions of use - (1) Chickens -
| Virginiamycin
grams/ton | Combination in grams/ton | Indications for use | Limitations | Sponsors |
|---|---|---|---|---|
| (i) 20 | Broiler chickens: For prevention of necrotic enteritis caused by | Not for use in layers | 066104 | |
| (ii) 20 | Amprolium 72.6 to 113.5 | Broiler chickens: For prevention of necrotic enteritis caused by | For field conditions where only | 066104 |
| (iii) 20 | Amprolium 113.5 to 227 | Broiler chickens: For prevention of necrotic enteritis caused by | For most field conditions as they exist under modern management practices, feed 113.5 g/ton amprolium continuously. Where severe coccidiosis conditions exist, feed 227 g/ton. Use as the sole source of amprolium. Do not use in feeds containing bentonite. Not for use in laying chickens. Amprolium as provided by No. 016592 in § 510.600(c) of this chapter | 066104 |
| (iv) 20 | Diclazuril 0.91 | Broiler chickens: For prevention of necrotic enteritis caused by | Feed continuously as the sole ration. Do not use in hens producing eggs for human food. Diclazuril as provided by No. 016592 in § 510.600(c) of this chapter | 016592 |
| (v) 20 | Lasalocid 68 to 113 | Broiler chickens: For prevention of necrotic enteritis caused by | Feed continuously as the sole ration. Do not feed to laying chickens. For broiler or fryer chickens only. Lasalocid as provided by No. 054771 in § 510.600(c) of this chapter | 066104 |
| (vi) 20 | Monensin 90 to 110 | Broiler chickens: For prevention of necrotic enteritis caused by | Feed continuously as the sole ration. Do not feed to laying chickens. See § 558.355(d) in this chapter. Monensin as provided by No. 058198 in § 510.600(c) of this chapter | 066104 |
| (vii) 20 | Salinomycin 40 to 60 | Broiler chickens: For prevention of necrotic enteritis caused by | Feed continuously as the sole ration. Do not feed to chickens over 16 weeks of age. Do not feed to laying chickens. Not approved for use with pellet binders. May be fatal if accidentally fed to adult turkeys or horses. Salinomycin as provided by No. 016592 in § 510.600(c) of this chapter | |
| (viii) 20 | Semduramicin 22.7 | Broiler chickens: For prevention of necrotic enteritis caused by | Feed continuously as the sole ration. Do not feed to laying hens. Semduramicin as provided by No. 066104 in § 510.600(c) of this chapter | 066104 |
| (ix) 20 | Semduramicin (biomass) 22.7 | Broiler chickens: For prevention of necrotic enteritis caused by | Feed continuously as the sole ration. Withdraw 1 day before slaughter. Do not feed to laying hens. Semduramicin as provided by No. 066104 in § 510.600(c) of this chapter | 066104 |
(2) Swine -
| Virginiamycin grams/ton | Combination in grams/ton | Indications for use | Limitations | Sponsor |
|---|---|---|---|---|
| (i) 25 | Growing-finishing swine: As an aid in control of dysentery in swine up to 120 pounds in animals or on premises with a history of swine dysentery but where symptoms have not yet occurred | 066104 | ||
| (ii) 50 or 100 | Growing-finishing swine: For treatment and control of swine dysentery in swine up to 120 pounds | Feed 100 grams per ton for 2 weeks, 50 grams per ton thereafter | 066104 | |
| (iii) 100 | Growing-finishing swine: For treatment of swine dysentery in nonbreeding swine over 120 pounds | Feed for 2 weeks | 066104 |
(3) Cattle -
| Virginiamycin grams/ton | Combination in grams/ton | Indications for use | Limitations | Sponsor |
|---|---|---|---|---|
| (i) 13.5 to 16.0 | Cattle fed in confinement for slaughter: For reduction of incidence of liver abscesses | Feed continuously as the sole ration to provide 85 to 240 milligrams per head per day. Not for use in animals intended for breeding | 066104 | |
| (ii) [Reserved] |