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• W2011870070 abstract "An experiment was conducted to ascertain if follicles could reach ovulatory size after the largest follicle (dominant) has been removed at different times during a progestin treatment in anestrous ewes, and secondly to determine if these new follicles could respond to an hCG-induced ovulation and have similar function as corpora lutea. Mature crossbred sheep (n = 44) in anestrous were treated with an intravaginal sponge containing 40 mg of FGA (day 0 = sponge insertion) for 9 days. Treatments consisted of cauterization of the largest follicle on the experimental day 3 (T1), day 6 (T2) and day 9 (T3); day 12 to ascertain the size of the largest follicle in control ewes. During laparotomies, the diameters of the largest follicle (DF), and those of the second and third largest follicles (SF1 and SF2, respectively) were determined. On day 12, a second laparotomy was performed for those ewes which had their DF cauterized on days 3, 6 and 9, a fourth group was left intact and only laparotomized on day 12. At this time, the size of the new DF, SF1 and SF2 were determined. Immediately after the laparotomy on day 12, all the ewes were treated with 1000 i.u. of hCG to induce ovulation. Blood samples were collected daily from day 0 to 50 and samples were analyzed for progesterone concentrations. The size of the DF at the time of sponge removal was smaller that those observed on day 3 or 6 of sponge suggesting that follicles in ewes treated with this progestin regress and a new wave of follicular development ensues between day 6 and the time of sponge removal. The size of the DF on day 12 was also smaller in ewes that have the largest follicle removed at the time of sponge removal reflecting that these follicles had a shorter period of growth; however, the rate of growth was greater for these follicles than for follicles arising after cauterization on day 3 or 6 after sponge insertion. There were no differences among treatments, in the number of ewes that formed a corpus luteum (CL) in response to hCG. Life span of the corpora lutea did not differ among ewes having their DF removed on day 6 or 9 or those that served as controls, however, ewes that had their DF removed on day 3 developed longer lived CL in a larger proportion of animals. Average progesterone concentration during the life span of the induced corpora lutea was greater in control ewes than in any other experimental group. These observations allow us to conclude that, (a) the follicular dynamics observed in anestrous ewes treated with a progestin intravaginal sponge resembles that observed during the normal estrous cycle in the ewe; (b) the effects of progesterone on life span of the corpus luteum could not be only related to direct effects at the follicle but also involve changes in other components of the uterine–ovarian–hypothalamic axis; (c) the mechanisms controlling luteal life span seem to be different to those mechanisms controlling the function of the induced corpus luteum." @default.
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• W2011870070 date "2007-04-01" @default.
• W2011870070 modified "2023-09-27" @default.
• W2011870070 title "Ovarian follicular dynamics after cauterization of the dominant follicle in anestrous ewes" @default.
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• W2011870070 doi "https://doi.org/10.1016/j.anireprosci.2005.12.018" @default.
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