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  • Title: The effects of progesterone and oestradiol-17beta treatment on plasma hormone levels and on the reproductive behaviour of ewes in late anoestrus and early in the breeding season.
    Author: Cunningham NF, Saba N, Millar PG.
    Journal: Res Vet Sci; 1977 May; 22(3):324-9. PubMed ID: 877428.
    Abstract:
    The effects of progesterone and estradiol-17beta on plasma hormone levels and on reproductive behavior in ewes in late anestrus or the early breeding season were investigated. The ewes received sc implants of progesterone in conjunction with injections of estradiol-17beta. Removal of the implants in anestrous ewes was followed by a surge of plasma gonadotropins 20-48 hours later. The time from removal to the surge was significantly (p less than .001) shortened (7-20 hours) when estradiol was injected at the time of removal. 21 of 23 noncyclic ewes exhibited cyclical activity following treatment. 15 of these showed estrous behavior during the 4 days following removal of the implants. However, only 1 conception occurred in this group, while the conception rate was 82 percent among 17 ewes showing behavioral estrus at 15-21 days after implant removal. Removal of the implants from cyclic ewes had little effect on their estrous cycles, and no gonadotropin surge was observed. However, the injection of estradiol at the time of implant removal produced some degree of estrous synchronization in cycling animals.
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