[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: 21CFR558.205]

[Page 403-404]
 
                        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.  558.205  Dichlorvos.

    (a) Approvals. Type A medicated articles: 3.1 and 9.6 percent to 
000010 in Sec.  510.600(c) of this chapter.
    (b) Special considerations. (1) Dichlorvos is to be included in meal 
or

[[Page 404]]

mash or mixed with feed in crumble form only after the crumble feed has 
been manufactured. Do not mix in feeds to be pelleted nor with pelleted 
feed. Do not soak the feed or administer as wet mash. Feed must be dry 
when administered. Do not use in animals other than swine. Do not allow 
fowl access to feed containing this preparation or to feces from treated 
animals.
    (2) Dichlorvos is a cholinesterase inhibitor. Do not use this 
product in animals simultaneously or within a few days before or after 
treatment with or exposure to cholinesterase-inhibiting drugs, 
pesticides, or chemicals. If human or animal poisoning should occur, 
immediately consult a physician or a veterinarian. Atropine is 
antidotal.
    (3) Labeling for Type A articles and Type B feeds must include a 
statement that containers or materials used in packaging such Type A 
articles and Type B feeds are not to be reused and all such packaging 
materials must be destroyed after the product has been used.
    (c) Related tolerances. See Sec.  556.180 of this chapter.
    (d) Conditions of use. It is used in feed for swine as follows:
    (1) Amount per ton. Dichlorvos, 348 grams (0.0384 percent).
    (i) Indications for use. For the removal and control of mature, 
immature, and/or fourth-stage larvae of the whipworm (Trichuris suis), 
nodular worm (Oesophagostomum sp.), large roundworm (Ascaris suum) and 
the thick stomach worm (Ascarops strongylina) of the gastrointestinal 
tract.
    (ii) Limitations. For swine up to 70 pounds body weight, feed as 
sole ration for 2 consecutive days. For swine from 70 pounds to market 
weight, feed as sole ration at the rate of 8.4 pounds of feed per head 
until the medicated feed has been consumed. For boars, open or bred 
gilts, and sows, feed as sole ration at the rate of 4.2 pounds per head 
per day for 2 consecutive days.
    (2) Amount per ton. Dichlorvos, 479 grams (0.0528 percent).
    (i) Indications for use. For the removal and control of mature, 
immature, and/or fourth-stage larvae of the whipworm (Trichuris suis), 
nodular worm (Oesophagostomum sp.), large roundworm (Ascaris suum), and 
the thick stomach worm (Ascarops strongylina) of the gastrointestinal 
tract.
    (ii) Limitations. For boars, open or bred gilts, and sows, feed as 
sole ration at the rate of 6 pounds per head for one feeding.
    (3) Amount per ton. Dichlorvos, 334-500 grams (0.0366-0.0550 
percent).
    (i) Indications for use. An aid in improving litter production 
efficiency by increasing pigs born alive, birth weights, survival to 
market, and rate of weight gain. Treatment also removes and controls 
mature, immature and/or fourth stage larvae of whipworm (Trichuris 
suis), nodular worm (Oesophagostomum supp.) large roundworm (Ascaris 
suum), and the thick stomach worm (Ascarops strongylina) occurring in 
the gastrointestinal tract of the sow or gilt.
    (ii) Limitations. For pregnant swine; mix into a gestation feed to 
provide 1,000 milligrams per head daily during last 30 days of 
gestation.

[40 FR 13959, Mar. 27, 1975, as amended at 40 FR 50258, Oct. 29, 1975; 
48 FR 46515, Oct. 13, 1983; 51 FR 7397, Mar. 3, 1986; 51 FR 28547, Aug. 
8, 1986; 52 FR 2684, Jan. 26, 1987; 62 FR 35077, June 30, 1997]