Reproductive management is management of the reproduction of sport and performance mares. The point of this management is blocking of cyclicity when it is not desirable and stimulation of cycles when it is necessary. The biggest problem about this approach is caused by the fact that mares are the most fertile in the spring and summer, at the age of 5 to 15, when they should, at the same time, be the most successful in the sport. In order to harmonize sport and horse reproduction, the methods of assisted reproduction (embryo transfer, in vitro fertilization, ICSI, cloning and oocyte transfer), from which the embryo transfer is emphasized as the method with the highest percentage of success and the most commercially available, for getting offspring from sport mares or subfertile mares. This is important because the foals of the best sport mares are the most expensive due to excellent parents genetics that is expected to be manifested even on offspring. In addition, in order to maximize sport results of the mares, we use contraceptive methods that block cycles, postpone it or prevent the conception. The reason for this is the match between the sex cycles and the season of the competition, when mares change their behaviour affected by estrus, or have painful ovulations that are undesirable in training and competitions. Nowdays there are hormonal, surgical and mechanical methods for that purpose, and the most common is hormonal blocking of the cycle with synthetic progesterone.