CFR > Title 21 - Food and Drugs > CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER E—ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS (parts 500 to 590) > PART 558—NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS > SUBPART B—Specific New Animal Drugs for Use in Animal Feeds (§558.55 to §558.680) > 558.155—Chlortetracycline, sulfathiazole, penicillin.

558.155—Chlortetracycline, sulfathiazole, penicillin.

(a) Approvals. Type A medicated articles: (1) 20 grams of chlortetracycline hydrochloride, 4.4 percent (20 grams) sulfathiazole, and procaine penicillin equivalent to 10 grams of penicillin per pound to No. 046573 in § 510.600(c) of this chapter.
(2) 40 grams of chlortetracycline hydrochloride, 8.8 percent (40 grams) sulfathiazole and procaine penicillin equivalent in activity to 20 grams of penicillin per pound to No. 046573 in § 510.600(c) of this chapter.
(b) Specifications. (1) The antibiotic substance refers to the antibiotic or feed-grade antibiotic.
(2) The antibiotic activities are expressed in terms of the appropriate antibiotic standards.
(c) Related tolerances. See §§ 556.150, 556.510, and 556.690 of this chapter.
(d) Conditions of use. It is used for swine as follows:
(1) Amount per ton. Chlortetracycline, 100 grams plus penicillin, 50 grams plus sulfathiazole, 100 grams.
(2) Indications for use. For reduction of incidence of cervical abscesses. Treatment of bacterial enteritis (salmonellosis or necrotic enteritis caused by Salmonella choleraesuis and vibrionic dysentery). Maintenance of weight gains in the presence of atrophic rhinitis. Swine 10 pounds of body weight to 6 weeks post-weaning: Increased rate of weight gain and improved feed efficiency. Swine 6 to 16 weeks post-weaning: Increased rate of weight gain.
(3) Limitations. For swine raised in confinement (dry-lot) or on limited pasture. Feed as sole ration. Withdraw 7 days prior to slaughter.
Minimum Amount of Type C Feed Which the Animal Should Consume
Type of feed Approximate body weight in pounds Minimum desired daily feed intake in pounds
Prestarter (up to 6 weeks postweaning) 20 1
Starter (up to 6 weeks postweaning) 50 11/2
Grower (6-16 weeks postweaning) 80 2
Finisher (6-16 weeks postweaning) 150 3

Code of Federal Regulations

[40 FR 13959, Mar. 27, 1975, as amended at 51 FR 7397, Mar. 3, 1986; 51 FR 28547, Aug. 8, 1986; 52 FR 2684, Jan. 26, 1987; 61 FR 2415, Jan. 26, 1996; 62 FR 35077, June 30, 1997; 62 FR 67725, Dec. 30, 1997; 63 FR 11599, Mar. 10, 1998; 66 FR 46706, Sept. 7, 2001; 67 FR 21171, Apr. 30, 2002]