The white, in combination with the blue eyes, comes from the BEW gene. One copy of the gene results in the white markings and sometimes blue eyes, called "vienna marked". VM is not an accepted Holland variety. I'm not a breeder, but I do know that color comes secondary. What you should be looking at is his conformation- body/bone , head, ears, crown, feet/legs, condition, and fur ALL come before color on the table. When looking for a suitable match to breed him with, the doe should compliment these areas.