Zwartbles Since the beginning of the last century, dairy farmers in the Freisland region of Holland have kept Zwartbles Sheep, a strikingly handsome black sheep with a distinctive white blaze and 2 to 4 white "socks." these beautiful and elegant sheep serve as dual purpose animals - meat and milk. they are well able to cope with the lowland and mid-altitude conditions in England, Wales, and Scotland. Breed categories: rare, dual purpose (meat and milk)