The Chrome Calf is the offspring of a Bull and Chrome Cow. Its parent, the Chrome Cow was released on the May 23, 2011 as part of the GagaVille Event. When you harvest milk from your Dairy Farm (with 1 Bull and at least 1 Chrome Cow inside) there is a chance that a Chrome Calf will be born. When you harvest from your Cow Pasture with at least 1 Chrome Cow there is a chance that a Chrome Calf will be born.