This text explains in simple language the biological functions upon which horse reproduction is based, giving enough background to enable those working in stables and stud farms to cope with any problems that may arise. It does not swamp the reader with excessive detail and avoids being doctrinaire, arguing that there are many ways to the same end and that it is the duty of the vet to explain, but not to preach dogma. Its purpose throughout is to clarify and be a source of reference, advocating that the person on the spot should be in a position to make decisions based on background knowledge as well as experience.