Equine Reproductive Services

We are dedicated to providing comprehensive breeding and reproductive care for your horse with our reproductive specialist, theriogenologist Dr. Carlos Gradil.

Our Equine Reproductive Services include:

  •  Breeding management of mares
  •  Fertility evaluation of mares
  •  Twin reduction in mares
  •  Stallion services and embryo transfer
  •  Innovative Intrauterine Devices (IUDs) used to modulate the reproductive cycle

Why give horses pharmaceuticals to control estrus behavior, when they can produce their own progesterone? Inert IUDs - not coated with any drugs - cause a state of pseudo-pregnancy – absence of estrus = good behavior - in the mare for extended periods of time.

Our innovations continue with Dr. Gradil’s development of a novel IUD. The IUD self-assembles into a triangular shape and once inserted it stays in place. With its small size both insertion and removal are very easy.   Its presence in the uterus can be monitored externally using a portable metal detector - similar to the ones used at airports. At the end of the performance season, the magnetic IUD can easily be retrieved from the uterus using a magnetic wand.

Note: For convenience, breeding soundness examination of mares or stallions with infertility problems should be scheduled on specified days at Tufts Cummings School of Veterinary Medicine.


Breeding Stallions
Equine Reproductive News


Equine Studies Program Coordinator
Carlos M. Gradil, DVM, MS, PhD, DACT
Extension Professor

Office phone: 413-577-2214
Fax: 413-545-6326

Office location: 427Q ISB

Mailing address:
661 North Pleasant Street
University of Massachusetts
Amherst, MA. 01003