After-hours/Emergency Phone: 07 573 7606

07 573 7606

Te Puke Veterinary Centre Ltd

Reproduction Management

Artificial Insemination

Using rectal ultrasound, we can identify the follicles growing on your mares ovaries. The size of the follicle is a good indicator of ovulation and the best time to inseminate your mare.

Fresh and chilled semen placed in the uterus at the right time has the best chance of leading to pregnancy, with an average conception rate of about 55% to 70%. The semen must be easily on hand, collected and supplied daily or every second day, to be inseminated when the mare is coming close to ovulation.

Frozen semen has been cryogenically stored in liquid nitrogen. This has the advantage of lasting a indefinite length  of time and can be shipped around the world. The straws are quickly thawed from -200℃ to 37℃ and placed in the uterus in very small volumes.

As one might expect, the stress on the semen can cause many to no longer be viable.This combined with the relatively small volume results in reduced conception rates. Furthermore, stallions vary in their suitability to having their semen frozen. These 3 factors lead to a wide variation in conception rates, but worldwide the average tends to be about 40%.



Te Puke Veterinary Centre recommendations for inseminating mares:

  • Breed young mares. Mares older than 15 years have reduced fertility.

  • Avoid using maiden mares, as their uterus might be ill prepared for conception, especially when using frozen semen.

  • Avoid breeding to foal heats. These ovulations’ typically occur 5 to 14 days after foaling, at a time when the uterus can be still inflamed. This reduced conception rates.

  • Use quality semen. We can observe the semen under microscope at time of insemination to assess the motility and concentration of live semen. However it is important you choose a reputable source of semen prior to insemination.  Select a stallion that has a proven record of successful artificial insemination through fresh, chilled or frozen semen.

  • Unsure mares are up-to-date with vaccinations, teeth floated, hooves trimmed, at suitable body condition and blood work for minerals are adequate. You can even consider swabbing the uterus to ensure it is free of any bacterial infections.