no caste

Wow. Check this. I was perusing horseys to post and searched dun (fer sumpin diff'ent): Zebra-Striped Dun



All of these are considered "primitive" markings because dun is the color seen in early cave paintings of horses, in Przewalski's horse (an Asian wild horse), and in many American mustangs. Obvious zebra stripes on the legs are less common but also go along with the "primitive" dun gene.
http://uthappytrails.blogspot.com/20...riped-dun.html