a male twin = te'um (תאום) a female twin = te'umah (תאומה)
A freemartin.
It is called a freemartin.
Yes, that is very common.
Yes, these bovines are called Freemartins. They are primarily females that have been born with a twin brother that they have shared the same placenta with, and when the bull fetus was developing his sex organs in the womb, the testosterone in the system prohibited her ability to develop her normal sex organs, and consequently developed both female and male reproductive systems.
Freemartinism is when a heifer has male sex characteristics but has underdeveloped female sex organs. It is caused by sharing a placenta with a twin bull calf. The male sex hormones that is emitted by the male fetus as he develops in the womb inhibits the female's sex hormones, and consequently prohibits her from developing normal female reproductive organs. She retains the testosterone and develops bull-like characteristics after birth and as she gets older. Freemartins are sterile, so they're better off being raised for the freezer.
The fetus' umbilical cord. (Singular) The twin fetuses' mother. (Plural)
Freemartinism is when a heifer has male sex characteristics but has underdeveloped female sex organs. It is caused by sharing a placenta with a twin bull calf. The male sex hormones that is emitted by the male fetus as he develops in the womb inhibits the female's sex hormones, and consequently prohibits her from developing normal female reproductive organs. She retains the testosterone and develops bull-like characteristics after birth and as she gets older. Freemartins are sterile, so they're better off being raised for the freezer.
If you were to miscarry one twin the other fetus can still survive, but the chances for that are SLIM!!
The adjective/noun is 'jumelle(s)' (female) or 'jumeau(x)' (male) The verb is jumeler.
The female counterpart of a set of male-female twin calves has a 90% chance of being sterile or a non-breeder. When you have those high of chances for such cases, it is not recommended to keep that heifer for breeding purposes.
Chances are, something happened to the twin. But since the remaining baby has lots of room to grow, it will probably be born as if it were a single.