Do adult female Chimpanzees, Orangutans or any other animals have menstruation period ? What is the cycle?

Answer 1

Female chimps do experience menstration. They start their cycles when they are 10 or 11, though they dont reach sexual maturity until they are 12 or 14. The cycle is longer than the human cycle lasting 35 days in the common chimp, and 45 days in the bonobo chimp. Unlike in humans many of the stages, such as ovulation can be determined from the outside of the animal. Chimps who are most fertile swell up quite noticably. most other mammals have some sort of "menstration", dogs and horses come into heat once a month, they bleed at that time, but unlike humans that is a time when they are most fertile, humans are most fertile between days 10 and 17 of our 28 day cycle.

Answer 2

Animal Menstruation

Answer 3

Not like humans do. Usually other animals have a season in which they menstruate. Could be spring, summer, fall, winter, dry, rainy....there may be some animals that have a monthly cycle...but if there are they are few and far between.

Answer 4

http://en.wikipedia.org/wiki/Menstrual_cycle says tht only humans and great apes show a true menstrual cycle. Eumenorrhea denotes normal, regular menstruation that lasts for a few days (usually 3 to 5 days, but anywhere from 2 to 7 days is considered normal.The average blood loss during menstruation is 35 millilitres with 10-80 mL considered normal; many women also notice shed endometrium lining that appears as tissue mixed with the blood. An enzyme called plasmin (contained in the endometrium) tends to inhibit the blood from clotting. Not all menstruations result from an ovulatory menstrual cycle. In some women, follicular development may start but not complete, but oestrogens will form and will stimulate the uterine lining, which will be shed later.

http://ajp.amjpathol.org/cgi/content/full/157/6/1759 contains information about menstruation and similar topics in various mammals. http://www.biologymad.com/master.html?, http://www.biologymad.com/Hormones/Hormones.htm and http://www.howstuffworks.com/menstruation.htm may also be helpful for you.

The following mammals show menstrual flow: elephant shrews, Old World monkeys and apes, including humans. http://www.kband.com/reports/000116.html states that overt menstruation is recorded in a few species of new world monkeys and the Malayan flying lemur, as well as cat-like marsupials (dasyures), tree shrews, elephant shrews, hedgehogs and various species of free-tailed and American leaf-nosed bats and vampires. In all of these, the loss of blood is a non-event, compared to the situation in humans. There are anecdotal reports for menstruation in the coyote and African elephant.

http://www.madsci.org/posts/archives/apr2001/986666565.An.r.html states that menstruation is the shedding of the uterine lining between ovulations. Many mammals menstruate covertly, reabsorbing the uterine lining after it is shed so that bleeding is not externally visible. The mammals that menstruate are not all closely related to one another, so the site suggests that the process is probably widespread and that nearly all female mammals menstruate in some fashion.

http://psychcentral.com/psypsych/Menstrual_period#Menstruation_in_other_mamm als contains information with links to various scientific terms. It states that a regular menstrual cycle occurs in the great apes, varying from 29 days in orang-utans to 37 days in chimpanzees. Females of other mammal species go through episodes called "oestrus" or "heat" in each breeding season. During these times, ovulation occurs and females become receptive to mating, a fact advertised to males in some way. If no fertilization takes place, the uterus reabsorbs the endometrium: no menstrual bleeding occurs. Significant differences exist between the oestrous and the menstrual cycle.