The growth, replacement, and wear of cattle teeth have a certain degree of regularity. The age of the identified cattle can be determined based on the change of the incisor teeth (ie, it is judged based on the growth 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 the general Yak is born, the first pair of larvae grows. At the age of 4-5 months, the four pairs of larvae grow together and gradually wear and shorten. The buffalo is about 3 years old and the first pair of cattle is 1.5-2 years old. The first pair of permanent teeth grows, that is, "tooth". After that, it will fall off and update one pair each year. Gradually it will change from "4 teeth", "6 teeth", to "8 teeth (that is, "Qikou"). The buffalo will be about 6 years old. Qikou, the cattle are 4.5-5 years old.
After the cow is flushed, the permanent teeth start to wear sequentially, and the wear surface gradually changes from a rectangular pattern to a black oval or even a triangle. The gap between the teeth gradually expands until the tooth roots are exposed and even permanent teeth fall off. The rectangular pattern appears on the tooth wear surface. "Indian." Buffalo is about 7 years old, and when the cattle are 5.5-6 years old, they will appear as "2 seals". Accordingly, wear 1 pair year by year until "8 seals". The buffaloes are about 10 years old and the cattle are 8.5-9 years old. The black oval pattern on the wear surface of the teeth is “beadsâ€. Buffalo is about 11 years old. When the yellow cattle are 9.5-10 years old, “2 beads†appear, and so on until “8 beads†(ie “full beadsâ€, also called “ The old mouth "), buffalo full of beads is about 14 years old, and the bees 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, when farmers purchase or breed cattle, it is necessary to select young and mature cattle for feeding in order to reduce the loss caused by aging cattle.
Second, according to the appearance of identification
According to the appearance of identifying the age of cattle, only the age of the young can be identified, and the accurate age cannot be judged.
The young cows are shiny, moderately stiff, with soft and elastic skin, full eyelids, bright eyes, and lively and vigorous behavior; while older cattle, on the other hand, have poorly held limbs, are shaggy and dull, and have dry skin. Depressed eyelids, sluggish eyes, wrinkled eyes and slow movements. In addition to the above changes, the water buffalo grows darker with age, and its density becomes thinner.
Third, according to the angle wheel authentication
The angle wheel is like a tree ring. Angle wheels are generally formed during the season when forage grass is dry or during pregnancy because of undernutrition. Once the cow has been delivered once, the surface of the corner forms a concave wheel. Therefore, the number of horns plus mating age is the cow age. But this is only accurate under normal circumstances. If the cow is empty, miscarried, sick or nutritionally unbalanced, the depth and breadth of the wheel will not be the same, and often the boundaries will be unclear and will not only be formed one year. Therefore, usually only large and obvious corner wheels are calculated. Otherwise, it will easily lead to judgment errors.
For breeding bulls with good conditions, there is generally no corner wheels in the corners.
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