A colt has six white teeth. If the teeth be of brown colour, the animal is 2 years old; if the central and corner teeth in both lines have fallen and sprouted again, the animal is from 3 to 5 years old, according as the number of such teeth is 3, 4 or 5; if the lines known as Kālikā , Pīta (a yellow line), Śukta (black line), Kācā (white line), Makṣīka (of the colour of the bee) or Śaṅkha (of the colour of the conch shell) appear in the teeth, the age of the animal will respectively be from 6 to 8, 9 to 11, 12 to 14, 15 to 17, 18 to 20 or 21 to 23. If depressions appear in the teeth or if the teeth have begun to shake, or if they have fallen, the age varies from 24 to 60.