Section 529.1940 - Progesterone intravaginal inserts(a)Specifications. Each insert contains: (1) 1.38 grams (g) progesterone in molded silicone over a nylon spine.(2) 0.3 g progesterone in molded silicone over a flexible nylon spine.(b)Sponsor. See No. 054771 in § 510.600(c) of this chapter for use of the product described in paragraph (a)(1) of this section as in paragraph (e)(1) of this section; and the product described in paragraph (a)(2) of this section as in paragraph (e)(2) of this section.(c)Related tolerances. See § 556.540 of this chapter.(d)Special considerations. Product labeling shall bear the following warning: "Avoid contact with skin by wearing protective gloves when handling inserts. Store removed inserts in a sealable container until they can be disposed of in accordance with applicable local, state, and Federal regulations."(e)Conditions of use - (1)Cows - (i)Amount. Administer one intravaginal insert per animal for 7 days. When used for indications listed in paragraph (e)(1)(ii)(A) of this section, administer 25 mg dinoprost as a single intramuscular injection 1 day prior to insert removal (Day 6). When used for indications listed in paragraph (e)(1)(ii)(B) of this section, administer 25 mg dinoprost as a single intramuscular injection on the day of insert removal (Day 7).(ii)Indications for use.(A) For synchronization of estrus in suckled beef cows and replacement beef and dairy heifers; for advancement of first postpartum estrus in suckled beef cows; and for advancement of first pubertal estrus in replacement beef heifers.(B) For synchronization of estrus in lactating dairy cows.(C) For synchronization of the return to estrus in lactating dairy cows inseminated at the immediately preceding estrus.(D) For induction of estrous cycles in anestrous lactating dairy cows.(iii)Limitations. Do not use in beef or dairy heifers of insufficient size or age for breeding or in animals with abnormal, immature, or infected genital tracts. Do not use in anestrous lactating dairy cows less than 42 days or greater than 78 days postpartum. Do not use in lactating dairy cows less than 40 days postpartum. Do not use in beef cows that are less than 20 days postpartum. Do not use an insert more than once. To prevent the potential transmission of venereal and bloodborne diseases, the inserts should be disposed after a single use. Administration of vaginal inserts for periods greater than 7 days may result in reduced fertility. Dinoprost injection for use as in paragraphs (e)(1)(ii)(A) and (B) of this section as in § 522.690 of this chapter, provided by Nos. 054771 and 061133 in § 510.600(c) of this chapter.(2)Ewes -(i)Amount. Administer one intravaginal insert per animal for 5 days.(ii)Indications for use. For induction of estrus in ewes (sheep) during seasonal anestrus.(iii)Limitations. Do not use in animals with abnormal, immature, or infected genital tracts; or in ewes that have never lambed. Do not use an insert more than once. To prevent the potential transmission of venereal and bloodborne diseases, the inserts should be disposed after a single use. 74 FR 59074 , Nov. 17, 2009, as amended at 75 FR 63085 , Oct. 14, 2010; 79 FR 10965 , 10974, Feb. 27, 2014; 79 FR 44278 , July 31, 2014; 87 FR 10970 , Feb. 28, 2022; 87 FR 17947 , Mar. 29, 2022 87 FR 10970, 2/28/2022; 87 FR 17947, 3/29/2022