The natural breeding season typically begins around mid-April. Beginning in late summer and early fall, the mare again will go into a transitional time similar to that seen in the spring. The periods of estrus and ovulations become more erratic and irregular.

Most breeders agree that the ideal time for a foal to be born is between May and July, when most grass is available to help the mare's milk supply. Since equine pregnancies run around 11 months, this generally means that an owner will want to get a mare in foal as early in the Spring as possible.

The guarantee applies to the stud fee only. It does not cover any veterinary, livery or postage fees. In the event that the chosen stallion is no longer available for whatever reason, you may choose another stallion of ours at stud. If at a more expensive stud fee, the difference is payable.

So-called periods of heat mirror the mare's ovarian activity. This occurs from April to October in general, and results in a succession of cycles lasting 21 days on average.

Regardless of whether you send your mare to a veterinary clinic to be bred, or your veterinarian comes to your farm to do the job, it's typically going to cost anywhere from $300 to more than $600 per estrus cycle, depending on semen type: cooled or frozen (the latter process can be slightly more expensive).

Courtship and Mating Mares are also “seasonally polyestrous,” meaning they have multiple estrous cycling throughout the spring and summer. The natural breeding season for horses in the Northern Hemisphere is the spring or summer. Light is the controlling factor in causing mares to come into heat in early spring.