The estrous cycle (also oestrous cycle; derived from Latin oestrus and originally from Greek οἶστρος meaning sexual desire) comprises the recurring physiologic changes that are induced by reproductive hormones in most mammalian therian females. Estrous cycles start after puberty in sexually mature females and are interrupted by anestrous phases or pregnancies. Typically estrous cycles continue until death. Some animals may display bloody vaginal discharge, often mistaken for menstruation, also called a "period".
Other articles related to "estrous cycle, cycle":
... The cycle is controlled by several hormones which regulate the estrous cycle, the mare's behavior, and the reproductive system of the mare ... The cycle begins when the increased day length causes the pineal gland to reduce the levels of melatonin, thereby allowing the hypothalamus to secrete GnRH ... may however have multiple FSH waves during a single estrous cycle, and diestrus follicles resulting from a diestrus FSH wave are not uncommon ...
... The estrous cycle (also spelled oestrous) controls when a mare is sexually receptive toward a stallion, and helps to physically prepare the mare for conception ... by the photoperiod (length of the day), the cycle first triggered when the days begin to lengthen ... The estrous cycle lasts about 19–22 days, with the average being 21 days ...
Famous quotes containing the word cycle:
“Only mediocrities progress. An artist revolves in a cycle of masterpieces, the first of which is no less perfect than the last.”
—Oscar Wilde (18541900)