I have been trying to figure out this color since the day I got him. My colt has these streaks of light brown/blonde that just go through the top of his mane and tail. Underneath it is all black. It is not sunbleached. We have tried uv fly sheets and night turnout and it doesn't go away. So I guess that is his color or I have also heard that mineral deficiencies can cause the blonde.
Anyone have any ideas?