Freemartin
In cattle twins of different sexes, the ovaries in the female
fetus are musculinized, and the female can not be used as a cow.
There are various theories on its pathogenesis including changes
in the genial organ in the female fetus caused by blood exchange
in the uterus due to the actions of hormones of the twin fetuses.
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Masanobu Goryo
Address inquiries to the following.
E-Mail:goryo@iwate-u.ac.jp
Department of Veterinary Pathology, Faculty of Agriculture,
Iwate University., Morioka, 020-8550, Japan