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However, the ovarian dynamics and plasma levels of FSH and LH have been studied only by Vandeplassche et al.
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have discussed some aspects of the sexual behavior as well as some characteristics of the estrous cycle in donkeys (Equus asinus). Nishikawa & Ya-masaki, Vandeplassche et al. The mean concentration of progesterone was < 1 ng/ml during estrus, after which it increased, reaching a steady state between 5 and 14 days postovulation.įew reports have been published on the study of the estrous cycle of jennies. On the first day of diestrus, the size of the CL was 28.53 ± 4.94 mm or 77.7% of the size of the preovulatory follicle. The dominant ovulatory follicle detected at the end of diestrus developed to more than 30 mm in diameter from Day 20 until ovulation at Day 24, and the remaining follicles regressed. A gradual reduction of this follicular population was observed during estrus. Otherwise, the 11–20-mm follicular population increased from Days 7 and 8 postovulation, and reached a maximum number at the final phase of diestrus. This was followed by a gradual reduction of the follicular population, with minimum variation until the next ovulation. The number of 2–10–mm follicles increased in the postovulatory period and remained constant until Day 5 of diestrus.
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The lengths of estrus, diestrus, and the interovulatory interval were 6.3 ± 2.17, 17.95 ± 2.04, and 24.2 ± 3.2 days, respectively. The ovaries were examined by ultrasonography, and venous blood samples were collected daily. Dynamic ovarian events, ovulation, and plasma progesterone concentration were studied in 20 estrous cycles of 13 jennies.