Superfetation

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Superfetation (also spelled superfoetation and superfoetation - see fetus) is a simultaneous occurrence of more than one stage of development of offspring in the same animal. It is not believed that it happens naturally in humans. There are 10 possible cases of superfission reported in humans.

In mammals, it manifests as the embryo formation of different estrous cycles while other embryos or fetuses are present in the womb. When two separate fertilization cases occur during the same menstrual cycle, this is known as superfecundation.

Superfetation is commonly claimed in several animal species. In mammals, it can only happen where there are two uteri, or where the estrus cycle continues through pregnancy.

Video Superfetation

Hewan lain

Animals claimed to be subject to superfetation include rodents (rats and mice), rabbits, horses, sheep, marsupials (kangaroos and sugar gliders), felines, and primates (humans). Superfetation has also been shown clearly and normally for some species of poeciliid fish.

Maps Superfetation

Man

While suspected superfetation cases have been reported in humans, the presence of this phenomenon in humans is considered unlikely. Better explanations include differential growth between twins for various reasons such as twin-to-twin transfusion syndrome. Artificial superfetation has been shown, though only until a short period after insemination.

In 2017, it was reported that an American woman who had agreed to act as a substitute for a Chinese couple gave birth to two babies initially believed to be twins. Before adoptive parents can return home to China, however, it is found that one of the babies is actually the biological child of the surrogate. Doctors confirmed that the biological mother had been pregnant with her and her partner's child about three weeks after becoming pregnant with the Chinese partner's child.

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References

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External links

• Superfetation in Cow Doctor's Thesis; Joel Andrew Carter, Louisiana State University, Defend 2002-03-18
• Superfetation in fish

Source of the article : Wikipedia