Ovulation cycle occurring in most mammalian therian females
For the biological genus name of the gadfly, see Oestrus (fly).
For Satyr leader, see Oestrus (mythology).
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The estrous cycle (from Latin oestrus 'frenzy', originally from Ancient Greek οἶστρος (oîstros) 'gadfly') is a set of recurring physiological changes induced by reproductive hormones in females of mammalian subclass Theria.[1] Estrous cycles start after sexual maturity in females and are interrupted by anestrous phases, otherwise known as "rest" phases, or by pregnancies. Typically, estrous cycles repeat until death. These cycles are widely variable in duration and frequency depending on the species.[2] Some animals may display bloody vaginal discharge, often mistaken for menstruation.[3] Many mammals used in commercial agriculture, such as cattle and sheep, may have their estrous cycles artificially controlled with hormonal medications for optimum productivity.[4][5] The male equivalent, seen primarily in ruminants, is called rut.[2]
^Hill, M. A. (2021, April 6) Embryology Estrous Cycle. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Estrous_Cycle
^ abBronson, F. H., 1989. Mammalian Reproductive Biology. University of Chicago Press, Chicago, IL, USA.
^Llera, Ryan; Yuill, Cheryl (2021). "Estrous Cycles in Dogs". VCA Hospitals. Retrieved April 6, 2021.
^"Synchronizing Estrus in Cattle - How does estrus synchronization work?". Texas A&M AgriLife Extension Service. Retrieved 2021-03-22.
^Medicine, Center for Veterinary (2021-03-05). "The Cattle Estrous Cycle and FDA-Approved Animal Drugs to Control and Synchronize Estrus—A Resource for Producers". FDA.
The estrouscycle (from Latin oestrus 'frenzy', originally from Ancient Greek οἶστρος (oîstros) 'gadfly') is a set of recurring physiological changes...
old, at which age female dogs will start having an estrouscycle. There are four stages of estrous: proestrus, estrus, diestrus, and anestrus. A dog in...
The cycle is controlled by several hormones which regulate the estrouscycle, the mare's behavior, and the reproductive system of the mare. The cycle begins...
mature. Female dogs have an estrouscycle that is nonseasonal and monestrus, i.e. there is only one estrus per estrouscycle. The interval between one estrus...
mouse. In most other mammals, the endometrium is reabsorbed in the estrouscycle. During pregnancy, the glands and blood vessels in the endometrium further...
estrouscycle and it shortens estrouscycles. The second signal is released during the ovulatory phase of the estrouscycle and it lengthens estrous cycles...
continue to undergo regular estrouscycles until death unless the cycle is interrupted by a pregnancy. In cows, a complete estrouscycle lasts 21 days. Most commonly...
veterinary medicine, it helps differentiate the stages of the mammalian estrouscycle because the vaginal epithelium changes in response to sex hormone levels;...
artificial insemination. The term “estrus” refers to the phase of the estrouscycle in which a sexually mature, non-pregnant female is receptive to sexual...
or proliferative phase, is the phase of the estrouscycle (or, in primates for example, the menstrual cycle) during which follicles in the ovary mature...
and hormonal intrauterine devices (IUDs). Most female mammals have an estrouscycle, but only ten primate species, four bat species, the elephant shrews...
dynamics is essential. If a female hamster encounters a male when her estrouscycle is not at the point for mating, then the two hamsters will be aggressive...
though mares in the wild may allow a foal to nurse for up to a year. The estrouscycle, also known as "season" or "heat" of a mare occurs roughly every 19–22...
subsequent estrouscycles semiannually, during which the body prepares for pregnancy. At the peak of the cycle, females will become estrous, mentally and...
through the vagina (in mammals that go through a menstrual cycle). Across an estrouscycle, the functional layer regenerates to provide nourishing tissue...
deuterostome developmental biology diakinesis dioestrus In the mammalian estrouscycle, the long period of quiescence following ovulation, during which the...
and a divided uterus; many have a marsupium, the pouch. The average estrouscycle of the Virginia opossum is about 28 days. Opossums do possess a placenta...
dictionary. The mating season is the seasonal period when a female animal's estrouscycle is active, signaling animals to mate The Mating Season or variation...
hormones during periods such as pregnancy, lactation, and following the estrouscycle. This is particularly visible in pyramidal cells of the CA1 region of...
was analyzed through immunoassay to know about their luteal phase. Estrouscycle duration was of about 33 days. During pregnancy, ultrasonography showed...
does not occur, the secretory lining will be absorbed (estrouscycle) or shed (menstrual cycle). The decidua is shed with the placenta during birth. As...
sexual maturity and undergoes estrouscycles (proestrus, estrus, metestrus, and diestrus). As a result of estrouscycling, the mammary gland undergoes...
maturation is 30.4 months for females and 27.7 months for males. The estrouscycle of the binturong lasts 18 to 187 days, with an average of 82.5 days...
of the risk, those spayed after one estrouscycle have 8.0% of the risk, and dogs spayed after two estrouscycles have 26.0% of the risk of developing...
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