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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