Blue roan, blue roan percheron, and roan percheron can be applied to any roan with a dark underlying coat that gives it a bluish cast. But this roan is dominantly a synonym for a roan with a black background coat or a blue roan percheron horse.
Many horse breeds carry this roan gene: blue roan percheron, and roan percheron are but two. Popular equine breeds without this roan are Thoroughbreds and Arabians. They have horses with grey color patterns that resemble roans, however, they are not genetically roan or considered blue roan percheron horses
BLUE ROAN FACTS
There are a few Thoroughbreds that look similar (blue roan percheron and roan percheron) but genetically, they are different. It’s difficult to comprehend the distinction, but by thinking about human genetics, it becomes clear.
Draft horse breeds, pony breeds, and also many equine breeds originating in North America possess the roan gene. These include the American Quarter horse, Percheron, Belgian, Welsh pony, American Paint Horse, and also Paso Fino.