The teeth age identification of cattle is mainly based on the degree of birth, replacement, and wear of the incisors. Yak cows have 1 pair of breast teeth at birth and 4 to 5 months after birth. Afterwards, the teeth of the breast cup begin to fall off, permanent teeth are replaced, and wear gradually. The regularity is as follows: 1.5 to 2 years old, the first pair of shedding teeth fall off, the permanent teeth are replaced, and the pair of teeth is called 2 years old; 2.5 to 3 years old, the first The two pairs of shedding teeth fall off, the permanent teeth are replaced, and she is called three-year-old two-tooth teeth; between 3.5 and 4 years old, the third pair of shedding teeth fall off, the permanent teeth are changed, and three pairs of teeth are said to be four years old; the fourth pair is 4.5 to five years old. The teeth of the larynx are detached, the permanent teeth are replaced, and they are called Qikou. Between the ages of 6 and 7, there are beaded dots in the middle of the first pair of incisors. In the 7 to 8 years old, there are beaded dots in the middle of the second pair of incisors. From 8 to 9 years old, The third pair of incisors showed beaded dots in the middle; at the age of 10, beads appeared in the middle of the fourth pair of incisors.
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