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58010

Federal Register / Vol. 86, No. 200 / Wednesday, October 20, 2021 / Rules and Regulations
Chlortetracycline amount
Combination in grams/
ton
Indications for use
Limitations
xlvi 500 to 4,000 g/ton to provide 10 mg/lb of body weight daily.

Lasalocid, 30 to 181.8;
melengestrol acetate, 0.25 to 2 g/ton to provide 0.25 to 0.5 mg/
head/day melengestrol acetate.

Growing beef heifers fed in confinement for slaughter up to 800
pounds: For the treatment of bacterial enteritis caused by Escherichia coli and bacterial pneumonia caused by Pasteurella multocida organisms susceptible to chlortetracycline, control of coccidiosis caused by Eimeria bovis and E. zuernii, increased rate of weight gain, improved feed efficiency, and suppression of estrus heat.

xlvii 500 to 4,000 g/ton to provide 10 mg/lb of body weight daily.

Lasalocid, 30 to 181.8;
melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg/head/day melengestrol acetate.

Replacement dairy heifers up to 800
pounds and less than 20 months of age and replacement beef heifers up to 800 pounds: For the treatment of bacterial enteritis caused by Escherichia coli and bacterial pneumonia caused by Pasteurella multocida organisms susceptible to chlortetracycline, control of coccidiosis caused by Eimeria bovis and E. zuernii, and suppression of estrus heat.

The melengestrol acetate Type C
top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 500 to 4,000 g/ton of chlortetracycline and 30 to 181.8 g/
ton lasalocid to provide 10 mg chlortetracycline per lb of body weight per day and 1 mg lasalocid per 2.2 lb of body weight per day with a maximum of 360 mg lasalocid per head per day for not more than 5 days of feeding. After completing feeding of this combination, continue feeding a Type C top-dress medicated feed containing melengestrol acetate alone.
See 558.311d of this chapter.
Chlortetracycline, lasalocid, and melengestrol as provided by No.
054771 in 510.600c of this chapter.
The melengestrol acetate Type C
top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 500 to 4,000 g/ton of chlortetracycline and 30 to 181.8 g/
ton lasalocid to provide 10 mg chlortetracycline per lb of body weight per day and 1 mg lasalocid per 2.2 lb of body weight per day with a maximum of 360 mg lasalocid per head per day for not more than 5 days. After completing feeding of this combination, continue feeding a Type C top-dress medicated feed containing melengestrol acetate alone. See 558.311d of this chapter. Chlortetracycline, lasalocid, and melengestrol as provided by No.
054771 in 510.600c of this chapter.

558.342

lotter on DSK11XQN23PROD with RULES1

31. In 558.342, revise paragraph e1iv to read as follows:

Melengestrol.

e

Indications for use

iv 0.25 to 0.5

Monensin, 10 to 40

Heifers fed in confinement for slaughter:
For increased rate of weight gain, improved feed efficiency, and suppression of estrus heat; and for the prevention and control of coccidiosis due to Eimeria bovis and E. zuernii.

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Combination in mg/head/day
16:22 Oct 19, 2021

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Melengestrol acetate in mg/head/day
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Limitations
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Add at the rate of 0.5 to 2.0 lb/head/day a 016592
medicated feed liquid or dry containing 045771
0.125 to 1.0 mg melengestrol acetate/lb 058198
to a feed containing 10 to 40 g of monensin per ton to provide 0.25 to 0.5
mg melengestrol acetate/head/day and 0.14 to 0.42 mg monensin/lb body weight, depending on severity of coccidiosis challenge, up to 480 mg monensin/
head/day. See 558.355d of this chapter. Monensin as provided by No. 016592
or 058198; melengestrol acetate as provided by No. 016952, 054771, or 058198
in 510.600c of this chapter.

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