freemartin

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freemartin

(frē′mär′tn)
n.
A female animal, usually a calf, that is born as the twin of a male animal and is sterile because of having abnormal internal reproductive organs.

freemartin

a female twin born with a male, in which normal female sexual development has been adversely affected by hormones produced by the male twin.
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References in periodicals archive ?
However, if you end up with a male/female pair, and you're a glass-half-full sort of person, there are ways to tell if your female is a heifer or a freemartin.
Touching placentas will often form into one, ensuring a freemartin. If there are two distinct placentas, the female calf may well be fertile.
Feel around for an extra opening or protrusions; both indicate a freemartin.
Due to freemartins, the practice of purchasing or retaining the female half of twins for breeding purposes should be avoided.
Since a freemartin is outwardly female, about the only accurate way to determine this status when purchasing calves is an examination by a vet.
Wright's freemartin." His publication also included a precise drawing of the gonads and reproductive tract of an animal with this anomaly.