What Does AMH Say About Your Stallion or Mare?

Anti-Mullerian hormone is a reliable marker for cryptorchidism, granulosa-cell tumors, and, possibly, mare fertility.
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Researchers at the University of Kentucky Gluck Equine Research Center, in Lexington, have spent the last decade studying a hormone that’s linked to a number of reproductive conditions. It’s called anti-Mullerian hormone (AMH), and it’s proved a reliable marker for cryptorchidism in stallions, granulosa-cell tumors in mares, and, possibly, mare fertility.

At the 2016 Theriogenology Conference, held July 27-30 in Asheville, North Carolina, the Gluck Center’s Barry Ball, DVM, PhD, described current applications of AMH.

AMH in Stallions

In the normal male horse, AMH is produced is high concentrations in the fetal testes, with concentrations declining as the horse hits puberty, said Ball.

This is because the blood-testis barrier forms at puberty, causing AMH to decline in the blood and begin appearing in the seminal fluids. It continues to show up in lower concentrations in blood, as well as in seminal plasma, in the adult horse. As with other reproductive parameters, AMH concentrations in blood vary with season

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Alexandra Beckstett, a native of Houston, Texas, is a lifelong horse owner who has shown successfully on the national hunter/jumper circuit and dabbled in hunter breeding. After graduating from Duke University, she joined Blood-Horse Publications as assistant editor of its book division, Eclipse Press, before joining The Horse. She was the managing editor of The Horse for nearly 14 years and is now editorial director of EquiManagement and My New Horse, sister publications of The Horse.

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