In the genes - is racing success inherited?

There can be no doubt that the hopes of both buyers and vendors at yearling sales are underpinned by the principle that racing success is at least partially determined by genetics. The yearlings that attract the highest prices are often those that are closely related to the best performed horses of the previous generation. However, most racing enthusiasts would agree that while having great bloodlines may make success on the racecourse more achievable, it by no means guarantees success.