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Electronic Code of Federal Regulations

e-CFR data is current as of December 5, 2019

Title 21Chapter ISubchapter EPart 522 → §522.840


Title 21: Food and Drugs
PART 522—IMPLANTATION OR INJECTABLE DOSAGE FORM NEW ANIMAL DRUGS


§522.840   Estradiol.

(a) Specifications. Each silicone rubber implant contains 25.7 or 43.9 milligrams (mg) estradiol and is coated with not less than 0.5 mg oxytetracycline powder.

(b) Sponsor. See No. 058198 in §510.600(c) of this chapter.

(c) Related tolerances. See §556.240 of this chapter.

(d) Conditions of use. For implantation in steers and heifers as follows:

(1) Amount. Insert one 25.7-mg implant every 200 days; insert one 43.9-mg implant every 400 days.

(2) Indications for use. For increased rate of weight gain in suckling and pastured growing steers; for improved feed efficiency and increased rate of weight gain in confined steers and heifers. No additional effectiveness may be expected from reimplanting in less than 200 days for the 25.7-mg implant or 400 days for the 43.9-mg implant.

(3) Limitations. For subcutaneous ear implantation in steers and heifers only. Safety and effectiveness have not been established in veal calves. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal.

[69 FR 67818, Nov. 22, 2004, as amended at 77 FR 31723, May 30, 2012; 81 FR 48702, July 26, 2016]

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