[Code of Federal Regulations]
[Title 21, Volume 6]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR558.145]

[Page 395]
 
                        TITLE 21--FOOD AND DRUGS
 
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN 
                          SERVICES (CONTINUED)
 
PART 558--NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS--Table of Contents
 
      Subpart B--Specific New Animal Drugs for Use in Animal Feeds
 
Sec.  558.145  Chlortetracycline, procaine penicillin, and sulfamethazine.

    (a) Approvals. Type A medicated articles: (1) 20 grams of 
chlortetracycline per pound, 4.4 percent (20 grams) of sulfamethazine, 
and procaine penicillin equivalent in activity to 10 grams of penicillin 
per pound to 046573 in Sec.  510.600(c) of this chapter.
    (2) 40 grams of chlortetracycline per pound, 8.8 percent of 
sulfamethazine, and penicillin procaine equivalent in activity to 20 
grams of penicillin per pound to 046573 in Sec.  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.
    (3) Type C medicated feed contains in each ton, 100 grams of 
chlortetracycline, 50 grams of penicillin as procaine penicillin, and 
100 grams of sulfamethazine.
    (c) Related tolerances. See Sec. Sec.  556.150, 556.510, and 556.670 
of this chapter.
    (d) Conditions of use. (1) It is administered to swine in a Type C 
feed for reduction of the incidence of cervical abscesses; treatment of 
bacterial swine enteritis (salmonellosis or necrotic enteritis caused by 
Salmonella choleraesuis and vibrionic dysentery); prevention of these 
diseases during times of stress; maintenance of weight gains in the 
presence of atrophic rhinitis; growth promotion and increased feed 
efficiency in swine weighing up to 75 pounds.
    (2) Withdraw 15 days prior to slaughter.

[40 FR 13959, Mar. 27, 1975, as amended at 43 FR 19385, May 5, 1978; 47 
FR 39814, Sept. 10, 1982; 48 FR 30615, July 5, 1983; 51 FR 7396, Mar. 3, 
1986; 52 FR 2684, Jan. 26, 1987; 56 FR 14019, Apr. 5, 1991; 61 FR 18082, 
Apr. 24, 1996; 62 FR 14300, Mar. 26, 1997; 63 FR 27845, May 21, 1998; 66 
FR 46706, Sept. 7, 2001]