This is a fully updated edition of the widely read textbook by Dr Ann T. Bowling, following the sequencing of the complete horse genome. This is the only text to provide broad coverage of all genetics topics, focussing on horses. It covers all significant recent advances including micro-satellite testing. It describes basic horse genetics including coat colour, parentage, medical and population genetics, cytogenetics, performance breeding systems, and genetic conservation. New and revised topics include the development of genomics, gene expression, the relationship of the genome to physiological function, blood groups, transfusion medicine and haemolytic disease of new-born foals. It examines in greater depth the diversity of breeds of horse in the world. It is suitable for veterinary surgeons, animal scientists, undergraduate and postgraduate students, equine scientists, horse owners, and breeders.