colors
Colors accepted by The Jockey Club are bay, black, chestnut, dark bay or brown, gray, roan and white. See individual entries for definitions.
colt
An ungelded (entire) male horse four-years-old or younger.
commingle
Combining mutuel pools from off-track sites with the host track.
company
Class of horses in a race He last ran in stakes company.
Comparable Index (CI)
Indicates the average earnings of progeny produced from mares bred to one sire when these same mares are bred to other sires. A CI of 1.00 is considered average, 2.00 is twice the average, 0.50 half the average, etc.
condition book(s)
A series of booklets issued by a racing secretary which set forth conditions of races to be run at a particular racetrack.