chestnut
A horse color which may vary from a red-yellow to golden-yellow. The mane, tail and legs are usually variations of coat color, except where white markings are present.
colt
An ungelded (entire) male horse four-years-old or younger.
congenital
Present at birth.
cover
A single breeding of a stallion to a mare For example, “He covered 70 mares.”
crop
1) The number of foals by a sire in a given year. 2) A group of horses born in the same year. For example, “An excellent crop of three-year-olds.”