Until she gives birth, a calf is called a heifer. There are heifer calves which are the babies that drink milk. Heifer maidens are the 'teenagers' and an In Calf Heifer (ICH) is a pregnant heifer. Once a heifer gives birth, she becomes a cow.
Milk cows usually have their ears pierced with I.D. tags. Each cow has a different number that allows the dairy farmer to track her activities by computer. The cow's milk weight is recorded in the computer as well as any medicines she receives. Our cows have 2 tags - 1 small electronic one where all their information is stored and a larger physical ID for identifying the cows.
Cow's teeth are different from ours. On the top front, cows have a tough pad of skin instead of teeth. They have 8 incisors on the bottom front and 6 strong molars on the top and bottom of each side to grind their food. Cows have a total of 32 teeth.