BTW corn marks are dark spots on the roan that have returned to the base color. Usually caused by some sort of injury to the horse (like bite mark or scrap). They have nothing to do with the color of the horse. They just happen to be something that is found in roans.
Their are no 'brown' points on him at all. Just varying shades of grey from light grey to steel grey, and now I know what corn marks are I can say he only has a few and they are black. Posted via Mobile Device
I usually catergorize horses in terms of bay or chestnut, depending on whether or not the horse has black points. Is "brown" a version of bay, or a version of chestnut? I'm guessing it's a version of bay from the photos posted?
It's a version of bay. They've finally documented that brown is also caused by agouti, but a different form of it. So it's virtually the same as bay, just slightly genetically different. It still wouldn't show on a chestnut coat, like bay, but I believe can be carried by a chestnut and passed onto foals.
Agouti (bay horse) = A
Non-agouti (black horse) = a
Brown Agouti (brown horse) = At