In response to fluctuating hormone levels during each oestrous cycle, some eggs are released to resume development.

The oestrous cycle of ringtail possum lasts 28 days.

In species with oestrous cycles, females are generally only sexually active during the oestrus phase of their cycle.

The oestrous cycle (U.S: estrous cycle) is the reproductive system in most mammals.

These animals do not reproduce well in captivity, due to the difficulty of handling musth bulls and limited understanding of female oestrous cycles.

One difference is that animals that have oestrous cycles reabsorb the endometrium if conception does not occur during that cycle.

The swamp wallaby exhibits an unusual form of embryonic diapause, differing from other marsupials in having its gestation period longer than its oestrous cycle.

Most marsupial and eutherian mammals have a reproductive cycle known as the oestrous cycle (U.S: estrous cycle).

Although jennets come into heat within 9 or 10 days of giving birth, their fertility remains low and it is usual to wait one or two further oestrous cycles before rebreeding.

The Lee-Boot effect is a phenomenon concerning the suppression or prolongation of oestrous cycles of mature mice (and other rodents), when females are housed in groups and isolated from males.

If a mare is fit and healthy, with a normal oestrous cycle, there is no reason to suppose she will have problems in foaling, but it seems fair to suggest that teenage mares be checked out by a vet before you start working out names for the as-yet unconceived foal.