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Some animals may experience vaginal secretions that could be bloody. The female is not yet sexually receptive; the old corpus luteum degenerates; the uterus and the vagina distend and fill with fluid, become contractile and secrete a sanguinous fluid; the vaginal epithelium proliferates and the vaginal cytology shows a large number of non ...
The Bruce effect, or pregnancy block, [1] [2] is the tendency for female rodents to terminate their pregnancies following exposure to the scent of an unfamiliar male. [3] The effect was first noted in 1959 by Hilda M. Bruce, [4] and has primarily been studied in laboratory mice (Mus musculus). [1]
Every woman's personal experience of miscarriage is different, and women who have more than one miscarriage may react differently to each event. [ 145 ] In Western cultures since the 1980s, [ 145 ] medical providers assume that experiencing a miscarriage "is a major loss for all pregnant women". [ 123 ]
In aphids, a generation sexually conceived by a male and a female produces only females. The reason for this is the non-random segregation of the sex chromosomes 'X' and 'O' during spermatogenesis. [35] Facultative parthenogenesis is often used to describe cases of spontaneous parthenogenesis in normally sexual animals. [36]
The earliest bovids, whose presence in Africa and Eurasia in the latter part of early Miocene (20 Mya) has been ascertained, were small animals, somewhat similar to modern gazelles, and probably lived in woodland environments. [16] Eotragus, the earliest known bovid, weighed 18 kg (40 lb) and was nearly the same in size as the Thomson's gazelle ...
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The team looked at a series of 1,527 single-child pregnancies that ended in miscarriage - here’s what they found Placenta abnormalities could be the reason for miscarriages, study suggests Skip ...
Here, the male passes the sperm to the female's egg-laying tube, which will soon be fertilised by the sperm. [159] Many animals make plugs of mucus to seal the female's orifice after mating. Normally such plugs are secreted by the male, to block subsequent partners. In spiders the female can assist the process. [160]