Superfecundation

Superfecundation is a rare occurrence in human reproduction where two or more ovum from the same menstrual cycle are fertilized by sperm from separate acts of sexual intercourse. The term is derived from the Latin words super meaning "over, above" and fecundare meaning "to fertilize".

Overview[edit | edit source]

Superfecundation most commonly happens within hours or days of the first instance of fertilization with ovum remaining viable for a period up to five days. The phenomenon is less likely to occur in humans due to the release of hormones after fertilization that typically prevents further ovulation.

Types[edit | edit source]

There are two types of superfecundation: heteropaternal superfecundation and homopaternal superfecundation. Heteropaternal superfecundation occurs when two different males father fraternal twins. Homopaternal superfecundation occurs when one male fathers two children in separate acts of intercourse that occur within the same menstrual cycle.

Occurrence in Humans[edit | edit source]

Superfecundation is more common in animals than in humans. In humans, the occurrence is rare and typically only comes to light through the use of genetic testing.

Occurrence in Animals[edit | edit source]

Superfecundation is common in animals such as cats and dogs. In these species, a litter of offspring can have different fathers.

Legal Implications[edit | edit source]

The legal implications of superfecundation can be complex, particularly in cases of heteropaternal superfecundation. Issues can arise in relation to child support and custody.

See Also[edit | edit source]

Superfecundation Resources
Need Help Finding a Doctor? Need help finding a doctor or specialist anywhere in the world? Explore our world directory. WikiMD's DocFinder can assist you in locating millions of physicians.	Medical Knowledge Access the latest research - Most recent articles Ongoing trials.