Equine Artificial Insemination and Advanced Reproductive Technologies

Artificial insemination (AI) refers to the process of placing stallion semen into the uterus of the mare to be bred, without the act of breeding itself. It could be argued that AI has been the single largest and most far-reaching revolution in horse breeding this century. There are a number of advantages of breeding mares in this manner:

  • Reduced risk of injury to the stallion, mare and handlers.

  • Reduced risk of spreading diseases.

  • Improved fertility rates for some sub-fertile mares and stallions.

  • Ability for popular stallions to cover more mares during the breeding season.

  • Better ability for stallions to coordinate performance and breeding duties.

  • Ability to breed to the best stallions from anywhere in the world, increasing the pool of available genetics.

Please note that, while artificial insemination is available to almost all horse breeds around the world, racing Thoroughbreds are restricted to natural mating.

The term “fresh semen” is typically used to refer to semen that is collected from a stallion and inseminated into a nearby mare. Since fresh semen has a very limited storage lifespan, insemination takes place soon after collection.

“Chilled semen” refers to semen that has undergone cooling to facilitate short-term storage. Addition of a semen extender prolongs sperm lifespan by providing metabolic energy, buffering pH, neutralising oxidative stress and inhibiting bacterial growth. Cooling the semen prolongs its lifespan by slowing the sperm’s metabolism and energy usage. Chilled semen can last up to 24-48 hours, allowing it to be collected and transported to mares around Australia.

“Frozen semen” is processed in such a way that it can be stored in liquid nitrogen (-196 degrees Celsius) indefinitely. The semen can be stored for many years, and is only thawed immediately prior to insemination of the mare. Provided that mandated quarantine protocols have been met, frozen semen can be transported around the world. Semen imported to Australia from other countries is typically delivered frozen. In an AI program, it is sensible to have the frozen semen delivered to the AI facility in advance of the mare, so that it is ready to use when the mare is ready.

In AI programs, it is important for a veterinarian to use manual palpation and ultrasound to determine the optimum timing of insemination. This is typically referred to as “scanning” or “follicle testing”. A mare may require multiple ultrasound examinations to coordinate the timing of insemination. A veterinary clinic may offer a “cycle fee” or “breeding package”, which covers the cost of all of these scans for a given cycle in one package.

Embryo Transfer

Embryo transfer is a technique that allows one mare (the donor) to have a foal while another mare (the recipient) carries the foal to term and raises it. The major advantages of embryo transfer include:

  • The ability to breed with performance mares while simultaneously continuing their competition careers.

  • The ability for a mare to have more than one foal in each breeding season.

  • The ability to breed foals from a mare who cannot carry a pregnancy due to age, injury or disease.

In embryo transfer, the donor mare is inseminated as normal, and then the resulting embryo is retrieved from the mare’s uterus and transferred into a synchronised recipient mare. A suitable recipient mare may be one that is owned by the donor mare owner, or one that is leased from the breeding centre. These options are best discussed with the veterinarian ahead of time.

Intracytoplasmic Sperm Injection (ICSI)

ICSI is one of the most advanced techniques in equine reproduction. It is a valuable technique in challenging fertility cases, or where semen availability is limited. The major advantages of ICSI include:

  • The ability to breed foals from mares who cannot be bred conventionally due to age or disease.

  • The ability to breed foals from stallions with poor natural fertility.

  • The ability to breed with stallions with limited semen availability.

In ICSI, oocytes are collected from the mare’s ovaries in a process called oocyte pick-up (OPU). In a laboratory, each oocyte is injected with a single sperm cell. The resulting embryo is allowed to mature under the controlled environment of the laboratory until it is ready to be transferred to a recipient mare, or frozen for later use. For rare genetics, high-value genetics, or difficult fertility cases, ICSI provides a powerful solution.

Supporting Your Breeding Goals

Our team have vast expertise and experience in equine reproduction. Whether you are aiming to breed your own foal, fast-track your farm’s genetic base, maximise genetic potential, streamline your breeding operation or overcome fertility challenges, we are here to help you achieve your goals. Please feel free to reach out to us at admin@beaequine.com.au.

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