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→Aetiology
== Aetiology ==
== Aetiology ==
* Results from sexual modification of a '''female twin''' by the in-utero exchange of blood from a male fooetus.
* Results from sexual modification of a '''female twin''' by the in-utero exchange of blood from a male foetus.
* Freemartin is XX genetic female, but becomes an XX/XY chimera.
* Freemartin is XX genetic female, but becomes an XX/XY chimera.
* 90% of female calves born co-twin to a male will be freemartins.
* 90% of female calves born co-twin to a male will be freemartins.