The breed originated on the island of Jersey (off the coast of the British Isles). The color is usually a shade of fawn or cream with black muzzles. Jerseys are the smallest in body size of all dairy breeds. They mature quickly. The ideal cow shows sharpness with strength indicating productive efficiency. Jerseys are noted for the highest milkfat of all dairy breeds. The approximate weight of a mature cow in milk should be I 000 lb.