Three colors are recognized in North American yaks: Imperial Black, Native Black, and Golden.
Black Imperials: Frequently coal black at birth, Imperials are black with a shiny black nose. As they develop, depending on how wooly the animal is, they often take on a reddish cast from sun exposure. The silkier the coat the less likely it will be changed by exposure to sunlight. The reddish cast may be due to modifying or casting genes that act in the presence of the primary black gene and interaction with sunlight to create the reddish cast. This can also be seen in Black Angus cattle, Friesian horses and many other livestock breeds.Read More