Equine researchers at the University of Kentucky (UK) have been chasing anti-Mullerian hormone (AMH, which is produced by cells in fetal testes as well as granulosa cells) for quite some time. They’ve determined they can use it to test for cryptorchidism in male horses as well as ovarian tumors in mares. Now, they’re trying to see if the hormone can predict an aging mare’s remaining follicle count.