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We have just had twin Angus calves born to one of our cows. We have been told by two different ranchers in the area that often the female twin will be sterile. Is there any documentation to this, or is it folklore?
Last Updated: February 28, 2008
If twins are born with one male and one female, the bull will be normal, but there is a 90% chance that the female will be a freemartin (not fertile). The male hormones produced by the male fetus in the uterus will prevent development of the female fetus's reproductive tract. Your veterinarian can check the status of the female at three to four months of age to determine if she is normal or is a freemartin.
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