Book excerpt: Designing Speed in the Racehorse is an indispensable reference by Ken McLean, one of the world's foremost bloodstock advisors and pedigree experts. McLean discusses genetic affinities and pedigree patterns, analyzes the pedigrees of important sires and ancestors to isolate elements of speed and stamina, explains what characteristics to look for in a sire, and updates the elite mare list. Breeders will be especially interested in McLean's analysis of the conformation of many of the breed's most illustrious sires and the physical attributes and faults they passed on to their progeny. Best of all, he tells the current sire and dam lines most likely to produce quality racehorses. With his recommendations at hand, today's Thoroughbred breeder has an edge in the competitive world of racing.