Yes, I know about that one but is it not possible to add hair directly on the horse mesh? 
For example if I am to create and use a separate mesh for the horse mane how will that follow the animations? The horse neck has 3 bones+ the head.

If possible I would prefer to add hair straight on to the horse mesh. But....
The problem I am having is the existing horse UV map/ texture, imported and added on the horse, will not show up in UV editor. 
Does that mean I have to create a new UV map in Blender including all the "cutting of the mesh" and such? Seem like waste of time since I have 24 different horses and breed already made which only need mane and tail in Blender. :)

More suggestions please. :)