Dog bitches have an estrous cycle that is nonseasonal and monestrus, i . e . there is only one estrus per estrous cycle.
32.
The estrous cycle is about 23 days and the gestation period lasts 250 to 260 days . The calves weigh about at birth
33.
By breeding mares only at the peak of their estrous cycle, a few thoroughbred stallions have mated with over 200 mares per year.
34.
Females have their first ovulation at 13 14 months of age and have 20-to 26-day intervals between estrous cycles until they are fertilized.
35.
Estrous cycle duration was of about 33 days . During pregnancy, anovulatory period lasting 39 to 131 days, during which there was no ovulation.
36.
On the morning of the match, reports came down that Fashion was under the influence of her estrous cycle, but the race went on.
37.
The female has an estrous cycle of 44 days, with the estrus lasting five to ten days . Bobcats remain reproductively active throughout their lives.
38.
In the event no embryo is implanted, the decidualized endometrial lining is shed or, as is the case with species that follow the estrous cycle, absorbed.
39.
Females had an estrous cycle lasting nine to 12 days . Gestation lasted 49 to 51 days . They did not display a distinct reproductive season.
40.
Purportedly, captive female " P . aedium " have an estrous cycle of 10 days, a gestation period of 119 days, and apparently a single offspring.
