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Both the mare and the stallion can experience reproductive issues. Lack of estrous cycle in the mare and low production of sperm in the stallion are just two of the obstacles that may be seen in the breeding process. Calling in your veterinarian to evaluate both breeding partners may be necessary in order to determine where the infertility problem originates. Hormonal therapy and antibiotics in case of infection may be utilized to encourage a successful mating.
Infertility in horses is defined as the inability of a horse to conceive. Many factors can affect the ability of your mare or stallion to produce offspring.
Stallions – He may be sub fertile; he only manages to impregnate mares 50% of the time or less
Mares - Failure to conceive in a breeding season; your mare may not conceive during a breeding season at all despite all efforts made
The possible causes of infertility vary greatly for both stallions and mares.
Diagnosis of infertility will be done via a physical exam of your horse by his or her veterinarian. The physical exam will allow your veterinarian to find any obvious causes of infertility such as twisted testes in your stallion, or injury to your horse’s reproductive organs in the mare.
Once the physical exam is done, imaging may be necessary as well. One imaging test used is the ultrasound. Ultrasounds allow your veterinarian to get a better look at your horse’s internal organs to determine possible causes for the infertility. An endoscopy of the urethra of the stallion may be suggested. Biopsies can be taken from your mare’s uterus and if your stallion has any tumors those may be biopsied as well. Tests may also be run on semen, uterine cultures or blood to determine underlying causes of infertility. In some cases, there can be more that one problem, encountered concurrently, that is causing the infertility of either horse.
Treatment of your horse’s infertility will largely be dependent on the underlying causes. In the event of STDs, infections and hormone imbalances for example, medication management may be an option to get these underlying issues controlled. If endometritis is the concern, there are options such as a routine of douching your mare’s uterus with a salt solution that can result in increased fertility. Cleansing of the penis of the stallion in the case of sheath irritation, NSAIDs due to injury, and surgery in the case of tumors may be required. Regulation of the estrous cycle and sexual rest for the stallion are other treatment methods that may be employed.
Ongoing follow up will be necessary as directed by your veterinarian. Recovery time will be dependent on what, if any procedures were done. Changes may be necessary to accommodate aging horses to assist them in mounting when breeding for example. Most concerns are not life threatening to your horse and many of the fertility issues can be treated accordingly.
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1 found helpful
We are having trouble getting our mares in foal this year. These are mares that we have bred several years, different ages, always had foals. These mares are being bred to a stallion that is 10 years old, that has produced foals for us for the past 6 years. Last year we had to rebreed the first 6 mares again on the second heat, then they caught. This year we have bred several mares to him for 3 heats, and finally just quit because it got too late in the season. We had a semen test done, he has excellent numbers and motility, very few abnormals. What else could be causing this?
Aug. 21, 2018
Dr. Michele K. DVM
The mares or stallion could have fertility problems or infectious disease. It would be best to have a veterinarian assess them and do any testing that might be necessary to rule out infectious disease before assuming there is a fertility problem.
Aug. 21, 2018
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