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Concealed ovulation or hidden estrus is the lack of any perceptible change (e.g., a change in appearance or scent) when an adult female is fertile and near ovulation. Some examples of perceptible changes are swelling and redness of the vulva in baboons and bonobos , and pheromone release in the feline family.
Additionally, they do not show obvious physical signals of high fertility. This has led many researchers to conclude that humans lost their estrus through evolution. [11] [page needed] It has been hypothesized that this could be due to the adaptive benefits of concealed ovulation and extended sexuality. [12] [page needed] [13] [page needed]
They found that the females concealed estrus and were sexually receptive during the entire mating season. Concealed estrus and sexual receptivity (at all times of the ovarian cycle) aids paternity confusion. This is because the males are unsure of who mated with the female during her fertile period, and so do not know the identity of the father.
There are varying views on evolution of overt menstruation in humans and related species, and the evolutionary advantages in losing blood associated with dismantling the uterine lining rather than absorbing it, as most mammals do. [22] The reason is likely related to differences in the ovulation process. [21]
Jones described the book as engaging and interesting. However, he questioned Diamond's treatment of concealed ovulation, finding it inconclusive. [3] The anthropologist Peter B. Gray and the evolutionary biologist Justin R. Garcia maintained that Why Is Sex Fun? was one of the best-read books on human sexuality. However, they considered it ...
The evolution of concealed ovulation has been theorized to be a result of altriciality and increased need for paternal investment—if men are unsure of the time of ovulation, the best way to successfully reproduce would be to repeatedly mate with a woman throughout her cycle, which requires pair bonding, which in turn increases paternal ...
Ovulation occurs about 109 hours after the start of follicle growth. Estrogen peaks at about 11 am on the day of proestrus. Between then and midnight there is a surge in progesterone, luteinizing hormone and follicle-stimulating hormone, and ovulation occurs at about 4 am on the next estrus day. The following day, metestrus, is called early ...
Ovulation is an important part of the menstrual cycle in female vertebrates where the egg cells are released from the ovaries as part of the ovarian cycle. In female humans ovulation typically occurs near the midpoint in the menstrual cycle and after the follicular phase. Ovulation is stimulated by an increase in luteinizing hormone (LH).