51 to 56cm. According to the query of Kyushu Drunk Catering Network, the size of the cow's head determines the size of the pot. The diameter of a normal adult cow's head is 41cm, so it is appropriate to choose a pot with a diameter of 51 to 56 cm for stewing the cow's head. Cattle and mammals are big, with two horns on the head, hooves on the toes and long hair on the tip of the tail. They are herbivorous and ruminant, and have great strength, and can plow fields or pull carts.