BloodHorse

A stud fee covers the right to breed a mare to a specific stallion for one season, and the price generally reflects the stallion's own race record, his early success as a sire, and demand from breeders trying to book a limited number of covers. Fees can range from a few thousand dollars for a regional stallion to well over 100000 dollars for a proven top tier sire.

Breeders study a horse's sire and damsire lines for patterns in distance aptitude, surface preference and durability, since these traits tend to run in certain bloodlines more consistently than others. Pedigree analysis is treated as one factor among many, since conformation, training and simple chance still play a large role in how any individual horse performs.

A maiden race is restricted to horses that have never won a race, giving newer or less proven horses a more even field to compete in. An allowance race is open to horses that have already won at least once but have not yet reached the level needed to compete in stakes company, making it a step up in competition from maiden ranks.

Owners often retire a colt to stud once his race record and reputation are strong enough to command significant breeding demand, since stud fees can generate more long term income than continuing to race and risking injury or a loss of form. Timing this decision well is part of why connections closely track a horse's Beyer figures, earnings and marketability throughout his racing career.

Official past performance data and race records are compiled by services like Equibase and the Jockey Club, which track every registered Thoroughbred's starts, finishes and earnings throughout its career. Many racing publications and stat sites pull directly from these official databases rather than compiling their own independent records.