 The term "sabino" is seldom used among American Quarter Horse breeders, as white patterning was originally considered undesirable.The American Quarter Horse breed was traditionally solid-colored and minimally-marked.Among Quarter Horse breeders, foals with ineligible amounts of white born to eligible parents were referred to as "cropouts," and, until 2004, horses that had areas of white hair rooted in pink skin beyond the gaskin on the hindleg, above the halfway point between the knee and elbow in the foreleg, or beyond the eye could not be registered.