I have heard that twin calves of the opposite sex are automatically sterile. Is this true?
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Answer posted by W Wagner
No, the calves are not automatically sterile. First of all there is nothing wrong with the bull calf, the problem is in the heifers. When a heifer and a bull are in the womb together the bull's testosterone overpowers and greatly affects the development of the heifer, possibly causing infertility known as free martin. However there is a slim chance the heifer may be fertile and be able to breed and raise a calf.
Answer posted by Hanson
You can have a blood test done to determine if a female is sterile (a freemartin).