Willinga Park offers specialised reproductive management of your mares and stallions. We breed horses by natural service, artificial insemination (AI) with fresh, chilled and frozen semen, and embryo transfer. We specialise in problem mares and stallions ranging from Warmbloods (Dressage and Showjumping), Australian Stock Horses, Quarter Horses, Paint Horses, Standardbreds, Ponies, Eventers, Draught Horses to Thoroughbreds. We offer infertility examinations for both mares and stallions. Evaluation of the reproductive tract of the mare can involve thorough evaluation of reproductive history, trans-rectal palpation, ultrasonography, endometrial culture and cytology of swabs, endometrial biopsy, hormonal evaluation, hysteroscopy and laparoscopy. We can examine stallions for breeding purposes and perform ultrasonography of their genital organs and collect and evaluate their semen to assess their fertility if required.

Twin Reduction

Nowadays twin pregnancies are nearly always resolved when identified at the first pregnancy scan. Fortunately, in the case where twins are not identified until much later, various options can be employed.

• manual reduction
• trans-vaginal puncture
• cranial cervical dislocation

We offer a referral service for mares with twins.

Fetal Sex Determination

Ultrasound examination of the pregnancy allows a determination of fetal sex to a very high degree of accuracy. Our preferred window is between 58 – 65 days from breeding. This service is available to permit breeders to develop their marketing and breeding strategies.


Laparoscopic surgery can be used to diagnose and treat a variety of infertility problems in both the mare and stallion. Mares with blocked oviducts can be treated by applying prostaglandin E gel on the oviducts using laparoscopy.

Removal of endometrial/ uterine cysts

Cysts are fluid filled structures that usually project outward or away from the surface of the endometrium into the uterine space. Most cysts do not cause a problem. In some cases the presence of one or numerous large endometrial cysts can cause fluid retention post breeding, impede motility of the early pregnancy and sometimes deprive a pregnancy from absorption of vital nutrients when it has a large surface contact with a cyst resulting in early embryonic death.

A number of treatment options are available to remove cysts.

Artificial Insemination (AI)

Artificial insemination can be regarded as an assisted reproductive technique since it consists of the manual deposition of the correct number of live motile spermatozoa into the mare’s uterus at the optimal time. This can include fresh, chilled, or frozen semen. The advantages of artificial insemination include; breeding a large number of mares with one ejaculate, transport semen from distant places using frozen or chilled, adding extenders and antibiotics to semen to increase the fertility of some stallions, not having to transport the mare to the stallion, breeding more mares to a stallion, reduce the risk of disease transmission, have greater access to stallions, earlier detection of fertility problems, decrease the risk of injury to the mare, stallion and personnel, and may be easier to breed the mare at the proper time.

The disadvantages of artificial insemination include; needing increased knowledge and skills in mare and stallion management, increased equipment needed. With this known, artificial insemination has become a widely accepted and used technique.

If you require further information or advice concerning artificial insemination please do not hesitate to contact us.

Embryo Transfer (ET)

Embryo transfer is the process in which the donor mare is bred and a surrogate mare (recipient) carries the pregnancy. This procedure has gained widespread acceptance and popularity among many breeders and breed registries. Embryo transfer is most successful with a fertile donor mare and a stallion with known fertility. When fertile mares and stallions are used, an embryo is recovered approximately 70% of the time. Embryo recovery in mares that are older (older and fewer oocytes (eggs)) or have had reproductive problems is approximately 30%.

Embryo transfer involves a few basic steps:

• The donor mare is reproductively evaluated to ensure a reasonable chance for success.
• The donor mare is bred using fresh, chilled or frozen semen. Conception rates may vary between these methods depending on both the mare and stallion.
• The embryo is removed from the donor mare’s uterus typically 6 to 8 days after ovulation.
• The embryo is located and evaluated under a microscope for appearance, shape and size.
• The embryo is non-surgically transferred into a recipient mare.
• The recipient mare is checked for pregnancy about one week after the transfer.

If you require further information or advice concerning Embryo Transfer please do not hesitate to contact us.

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