The method of identifying the age of beef cattle according to their teeth

The tooth age identification of cattle is mainly based on the birth and replacement of deciduous incisors and the wear degree of incisors. Calves have a pair of deciduous incisors at birth, and the full length of deciduous incisors is 4 to 5 months after birth. After that, the deciduous incisors begin to fall off, replace permanent teeth, and gradually wear out, the rules are as follows: 1.5 to 2 years old, the first pair of deciduous incisors fall off, replaced permanent teeth, called 2-year-old permanent teeth; 2.5-3 years old, the second pair of deciduous incisors fall off, replace permanent teeth, called 3-year-old two pairs of permanent teeth; 3.5-4 years old, the third pair of deciduous incisors fall off, transplant permanent teeth, called 4-year-old three pairs of permanent teeth From 4.5 to 5 years old, the fourth pair of deciduous incisors fall off and replace permanent teeth, which is called the same mouth; from 6 to 7 years old, bead dots appear in the middle of the first pair of incisors; 7 to 8 years old, bead dots appear in the middle of the second pair of incisors; 8 to 9 years old, bead dots appear in the middle of the third pair of incisors; 10 years old, bead dots appear in the middle of the fourth pair of incisors.