Bloodstock AgentA person who advises and/or represents a buyer or seller of Thoroughbreds at a public auction or a private sale. A bloodstock agent usually works on commission, often five percent of the purchase price, and can also prepare a horse for sale.
Blood-TypingA way to verify a horse's parentage. Blood-typing is usually completed within the first year of a horse's life and is necessary before registration papers will be issued by The Jockey Club.
Blow-OutA short, timed workout, usually a day or two before a race, designed to sharpen a horse's speed. Usually three-eighths or one-half of a mile in distance.
BoardShort for "tote board," on which odds, betting pools and other information are displayed.
BobbleA bad step away from the starting gate, usually caused by the track surface breaking away from under a horse's hooves, causing it to duck its head or nearly go to his knees.
BoltSudden veering from a straight course, usually to the outside rail.
BombA winning horse sent off at extremely high odds.
Book1) The group of mares being bred to a stallion in a given year. If a stallion attracts the maximum number of mares allowed by the farm manager, he has a full book. 2) A term used to describe a jockey's riding commitments with his agent An agent handles a jockey's book.
Bottom1) Stamina in a horse. 2) Subsurface of a racing strip.
Bottom LineA Thoroughbred's breeding on the female side. The lower half of an extended pedigree diagram.