The mare's estrus cycle is about 21 days, and she is receptive to the stallion for about 5-7 days. If she does not show interest in a stallion over the next week, she may likely be bred. The best way to determine for sure the status of your mare is to have your veterinarian preform a reproductive exam and ultrasound. If pregnant, and the foal is not wanted, an injection of prostaglandin may be given to terminate the pregnancy.




