Qinghai is an important livestock breeding center. Its livestock includes sheep, yaks, pian niu (crossbreed of bulls and yaks) and horses. Qinghai produces large quantities of sheep wool, meat, leather and sausage casings for other parts of the country. It is an important producer of medicinal materials such as caterpillar fungus, antlers, musk and rhubarb. Qinghai Lake is famous for its scaleless naked carp. The province grows spring wheat, highland barley, broad beans, potatoes and rapeseed.