10/07/2026
Good info on twin bull/heifer pairs.
A female calf can be born unable to reproduce when her twin is male.
This is called a freemartin. When male and female calves develop as twins, their placental blood vessels can connect, allowing hormones and cells to pass between them. This can interfere with normal reproductive development in the female calf.
About 90% of female calves born twin to a male are freemartins and are infertile.
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