breeding fund
A state fund set up to provide bonuses for state-breds.
bridge jumper
A person who wagers large amounts of money, usually on short-priced horses to show, hoping to realize a small, but certain profit. The term comes from the structure these bettors may seek if they lose.
broodmare
A filly or mare that has been bred and is used to produce foals.
brush
During a race, two horses who slightly touch each other.
bug boy
An apprentice rider.
bullring
A small racetrack, usually less than one mile.