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Reproduction

Artificial Insemination - Reproductive Health

For a large part of the summer we are busy with artificial insemination of mares. Our Veterinarians will be happy to discuss the advantages and disadvantages of using freshly collected semen, fresh chilled semen or frozen semen. Successful AI depends on regular monitoring of the mare’s ovaries and uterus so that she may be inseminated as close to ovulation as possible.

The timing of insemination will be determined by which semen is chosen. For fresh or chilled semen, conception rates are highest when insemination is performed within 24 hours preceding ovulation. Frozen-thawed semen has a relatively short life span and therefore requires that mares be inseminated immediately before (within 6 hours) or after (within 4 hours) ovulation. Therefore management of mares for insemination with frozen-thawed semen is more intensive and mares require multiple ultrasound examinations to assess the correct time for insemination. Many of these examinations need to occur outside of normal working hours, so for this reason we prefer to perform frozen inseminations at our clinic.

Conception rates for mares using frozen-thawed semen are often lower and therefore ideally this should be reserved for mares with the best reproductive histories. Insemination with chilled semen requires good communication with the stallion stud so that semen is delivered on time. After insemination, your mare will be checked for ovulation and for post-breeding inflammation. Provided all is well, your mare will be scanned at 16 days following ovulation and if pregnant, it is advised that scans be performed at 28 and 45 days to make sure the pregnancy is developing normally. Older or problematic mares may require further treatment in this early period.

Breeding Evaluation 

Our Equine Veterinarians have particular experience in equine reproduction and stud medicine. We provide veterinary services to local Standardbred horses, Pleasure and Sports horses and Thoroughbred stud farms. This includes routine gynecological and pregnancy examinations, management of fertility problems, treatment of mares and foals and dealing with obstetric and neonatal emergencies.

Before breeding from your mare, a full reproductive examination should be performed which will allow the Veterinarian to assess her suitability for breeding and highlight any potential reproductive problems. If your mare is going to stud or insemination is to be performed, the veterinary surgeon will be able to advise you on and perform any tests required before your mare goes.

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