A free martin heifer happens when a cow gives birth to mixed-sex twins, one bull calf and one heifer calf. In most cases, the two calves share blood circulation in the womb. This allows male hormones, particularly testosterone and anti-Müllerian hormone, to pass from the bull calf to the heifer calf. These hormones interfere with the development of the female reproductive tract, meaning the heifer is usually infertile and considered a free martin. Triplets in beef cows are extremely rare, making
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A free martin heifer happens when a cow gives birth to mixed-sex twins, one bull calf and one heifer calf. In most cases, the two calves share blood circulation in the womb. This allows male hormones, particularly testosterone and anti-Müllerian hormone, to pass from the bull calf to the heifer calf. These hormones interfere with the development of the female reproductive tract, meaning the heifer is usually infertile and considered a free martin. Triplets in beef cows are extremely rare, making
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