There are some registries that accept horses (and sometimes ponies and mules) of almost any breed or type for registration. Color is either the only criterion for registration or the primary criterion. These are called "
color breeds", because unlike "true" horse breeds, there are few other physical requirements, nor is the
stud book limited in any fashion. As a general rule, the color also does not always breed on (in some cases due to genetic impossibility), and offspring without the stated color are usually not eligible for recording with the color breed registry. There are breeds that have color that usually breeds "true" as well as distinctive physical characteristics and a limited stud book. These horses are true breeds that have a preferred color, not color breeds, and include the
Friesian horse, the
Cleveland Bay, the
Appaloosa, and the
American Paint Horse. The best-known "color breed" registries that accept horses from many different breeds are for the following colors: •
Buckskin: a color which cannot breed "true" due to the
cream gene which creates it being an
incomplete dominant •
Palomino: a color which cannot breed "true" due to the cream gene which creates it being an incomplete dominant •
Pinto: there exists a registry for Pinto-colored horses of varying breeds, distinct from the American Paint Horse registry, though some qualifying horses may be registered in both. •
White: some of these animals are registered in the United States with the
American creme and white horse registry, which was once called an "Albino" registry until it was understood that true
albino does not exist in horses. (
see White (horse) and Dominant white for details) ==Crossbred registration==