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Federal Register / Vol. 86, No. 52 / Friday, March 19, 2021 / Rules and Regulations
2 No. 069254 for use of product in paragraph a2 of this section as in paragraph d of this section.

69. In 558.78, revise paragraph b to read as follows:
558.78

Bacitracin zinc.

b Sponsor. See No. 054771 in 510.600c of this chapter.

70. In 558.95:
a. Revise paragraph a;
b. Redesignate paragraphs b and d as paragraphs d and e;
c. Add new paragraph b;
d. Add a heading for newly redesignated paragraph e5; and e. Revise newly redesignated paragraph e5iii.
The revisions and additions read as follows:
558.95

558.128

Chlortetracycline.

b Sponsors. See sponsors in 510.600c of this chapter as follows:

72. In 558.140, revise paragraph b introductory text to read as follows:
558.140 Chlortetracycline and sulfamethazine.

Bambermycins.

a Specifications. Type A medicated articles containing 2, 4, or 10 grams bambermycins per pound.
b Sponsors. See sponsors in 510.600c of this chapter as follows:

b Sponsors. See sponsors in 510.600c of this chapter as follows:

73. In 558.175:
a. Revise paragraph d3; and

b. Remove paragraph e.
The revision reads as follows:

558.175

Clopidol.

d
3 Combinations. Clopidol may also be used in combination with:
i Chlortetracycline as in 558.128.
ii Lincomycin as in 558.325.
74. Add 558.185 to read as follows:
558.185

Coumaphos.

a Specifications. Type A medicated articles containing 1.12, 2.0, 11.2, or 50
percent coumaphos.
b Sponsor. See No. 058198 in 510.600c of this chapter.
c Related tolerances. See 556.168
of this chapter.
d Special considerations. 1
Labeling shall bear the following warning: The active ingredient coumaphos is a cholinesterase inhibitor.
Do not use this product on animals simultaneously or within a few days before or after treatment with, or exposure to, cholinesterase-inhibiting drugs, pesticides, or chemicals.
2 See 500.25 of this chapter.
e Conditions of use in laying chickens.

Coumaphos in grams per ton
Indications for use
Limitations
1 27.2 0.003 percent.

Laying chickens: For control of capillary worm Capillaria obsignata and as an aid in control of common round worm Ascaridia galli and cecal worm Heterakis gallinae.
Replacement pullets: For control of capillary worm Capillaria obsignata and as an aid in control of common round worm Ascaridia galli and cecal worm Heterakis gallinae.

Feed continuously as the sole ration for 14 days. If reinfection occurs, treatment may be repeated, but not sooner than 3 weeks after the end of the previous treatment. Do not feed to chickens within 10 days of vaccination or other conditions of stress..

058198

Feed continuously as the sole ration for from 10 to 14 days. Do not feed to chickens under 8 weeks of age or within 10 days of vaccination or other conditions of stress. If birds are maintained on contaminated litter or exposed to infected birds, a second 10- to 14-day treatment is recommended, but not sooner than 3 weeks after the end of the previous treatment. If reinfection occurs after production begins, repeat treatment as recommended for laying flocks..

058198

2 36.3 0.004 percent.

Sponsor
75. In 558.195, revise paragraph b to read as follows:

76. In 558.258, revise paragraph b to read as follows:

558.195

558.258

558.261

Decoquinate.

b Sponsor. See No. 054771 in 510.600c of this chapter.

Florfenicol in grams/ton of feed
jbell on DSKJLSW7X2PROD with RULES

1 No. 016592: 2, 4, and 10 grams per pound for use as in paragraphs e1
through 4 of this section.
2 No. 012286: 2 grams for use as in paragraph e2 of this section and 0.4
and 2 grams per pound for use as in paragraph e3 of this section.

e
5 Combinations.
iii Clopidol as in 558.175.

71. In 558.128, revise paragraph b introductory text to read as follows:

Fenbendazole.

b Sponsor. See No. 000061 in 510.600c of this chapter.

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Jkt 253001

Feed as a sole ration for 10 consecutive days to deliver 10 to 15 mg florfenicol per kg of fish.
Feed containing florfenicol shall not be fed for more than 10 days. Following administration, fish should be reevaluated by a licensed veterinarian before initiating a further course of therapy. The effects of florfenicol on reproductive performance have not been determined.
Feeds containing florfenicol must be withdrawn 15 days prior to slaughter.

PO 00000

Florfenicol.

e
2

Limitations

ii 182 to 2,724 Freshwater-reared salmonids: For the control of mortality due to coldwater disease associated with Flavobacterium psychrophilum and furunculosis associated with Aeromonas salmonicida.

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Indications for use

77. In 558.261, revise paragraph e2ii to read as follows:

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