They are racehorses. Depending on the horse they may also be referred to as thoroughbreds.
The equestrian
The adjutant's call.
Track announcer.
its it called "The Call to the Post"
A jockey is the term for someone who rides horses in horse races. Or more specifically a horse jockey.
they did not do house races but they did horse races
Jockeys
They have horse races and car races.
chariot races, horse races, and gladiator fights
The pony horse
Oaks are races for fillies or mares
Mainly Colts