Not all stallion owners offer the service of shipped, cooled semen. And some stallions may not be good candidates for use of their semen in such a program. In addition, the management for the mare is shifted totally to the mare owner. Mare owners must make all arrangements with the stallion owner or manager to have semen shipped at a precise time. And then the owner has to make arrangements with a local veterinarian who specializes in equine reproduction.
Timing is everything in successfully mating mares.
Normally, mares ovulate about 48 hours before going out of estrus or heat. So it's mandatory to know how long the mare will be in estrus. Usually, mares have a 6-7 day estrus or heat period. Fortunately, once again technology aids the mare owner. Ultrasound can determine the size and growth rate of a developing follicle.