The Fan Calf is the offspring of a Bull and Fan Cow. Its parent, the Fan Cow was released on the April 20, 2010 available from the Market. When you harvest milk from your Dairy Farm (with 1 Bull and at least 1 Fan Cow inside) there is a chance that a Fan Calf will be born. When you harvest from your Cow Pasture with at least 1 Fan Cow there is a chance that a Fan Calf will be born.