The growth, replacement, and wear of cattle teeth have certain rules. The age of cows can be judged according to the change of incisor teeth, that is, according to the occurrence of milk teeth or the replacement of permanent teeth and permanent teeth.
The cow's milk teeth (ie, the teeth that grow after birth) are small and white, with obvious tooth necks and large tooth gaps. The permanent teeth (ie, the new teeth that are replaced after the milk teeth are removed) are large, thick and yellowish in color. Neatly, close to each other.
About 1 month after birth, the calf's teeth grew on the 1st, and after 4 to 4 months of age, the 4 pairs of breasts were gradually worn out. Buffalo is about 3 years old, and the first pair of cattle teeth is 1.5-2 year old. The first pair of shedding teeth fall off and she grows the first pair of permanent teeth, that is, “tooth teethâ€. After that, she falls off and updates one pair each year, gradually from “four teeth†and “six teeth†to "October" (ie "Qikou"), the buffalo is usually about 6 years old and the cattle is 4.5-5 years old. After the cow is flushed, the permanent teeth begin to wear sequentially, and the wear surface gradually changes from a rectangular pattern to a black oval and even to a triangle. The gap between the teeth gradually expands until the tooth roots are exposed and even permanent teeth fall off. The rectangular pattern on the wear surface of the teeth is "printed." Water buffalo is about 7 years old, and the yellow cattle are 5.5-6 years old, which means "two seals". According to this, one pair wears one year until the "eight seals", the buffalo is about ten years old, and the yellow cattle are 8.5-9 years old. The black oval pattern on the wear surface of the teeth is "beads." Buffalo is about 11 years old, when the yellow cattle from 9.5 to 10 years old, the "two beads" appear, and so on until the "eight beads" (that is, "full beads", also known as "old mouth"). Buffalo Manchu is about 14 years old, and the cattle are 12.5-13 years old. Buffalo is over 14 years old, and the cattle have reached the age of more than 13 years old. They basically lose their serviceability and their reproductive performance is basically lost.
Therefore, the age of the cow can be determined according to the law of the teeth of the cow.
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