pdieten t1_j6lq9wk wrote
Reply to comment by RealDDDeal in TIL When a cow has opposite sex twins, the female twin is usually born intersex and infertile. This happens because the twins blood supplies are linked, which exposes the female to male sex hormones. by awawe
https://en.wikipedia.org/wiki/Freemartin
"A freemartin is the normal outcome of mixed twins in all cattle species which have been studied. It does not normally occur in most other mammals, though it has been recorded in sheep,[14] goats,[15] and pigs.[16]"
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