Firstly- do you need to breed a foal. There are many foals already out there and choosing an existing foal means that you get to choose what you want- colour, gender, expected temperament and get a good idea of height. Putting a mare in foal means many of these are unknowns. Furthermore the cost of purchasing a healthy foal may be less or at least not more than the cost of getting a mare in foal, looking after her through to foaling and the risk of something happening to the mare or the foal. Most foalings are successful but there are known risks.