The milk production of dairy cows has a lot to do with age. Generally, 3 to 8 years old is the peak milk production period of dairy cows, and it will decrease with the increase of age. Therefore, if you want to know the milk production peak of dairy cows, you must know its Age, then do you know how to look at the age of the cow?
Cow age identification method
There are three main methods of identification commonly used, namely appearance, angle wheel and teeth. If it is foreign trade, it is generally only possible to identify the young and old cows, and it is impossible to know the exact age. If the angle wheel is identified, the error is large, and the tooth identification is relatively reliable.
Specific identification method:
1, teeth
The growth of cow teeth has a certain regularity. Before the cow is 5 years old, you can use the logarithm of the tooth loss plus 1 to calculate, which means that the change of 1 pair of teeth is 2 years old, the change of 2 pairs of teeth is 3 years old, and the change of 3 pairs of teeth is 4 years old. After 5 years old, it is necessary to look at the tooth surface wear and the structure of the bovine teeth.
When starting to wear, first smooth the edges of the teeth, then look at the changes in the tooth surface, initially square or cross-oval; later deepen with the degree of wear. For example, the teeth are square at the age of 6; they are triangular at 7 years old; they are quadrangular at 8 years old; they are round at 10 years old, and become smaller when they are 12 years old; Other incisors change in the same way as the teeth. As we age, all incisors begin to shorten.
Although this method of tooth identification is reliable, it is still an estimation result. Since the tooth exchange, growth and wear are affected by many factors, the identification results are actually different. For example, the early changes of early-maturing varieties are grazing for half a year, and some cows also have teeth that are not hard or deformed, so it is difficult to accurately identify their age, and the quality of forage will affect the teeth.
2, angle wheel
The cow's angle wheel is mainly affected by the nutrient deficiencies in the whole year, which leads to a large growth and change of the length and thickness of the horn, thus forming the length, thickness and texture. In the four distinct regions, cattle naturally graze their horns for faster growth. The hay season is slower due to malnutrition, so an annual angle is formed. In this case, we can estimate the age based on the number of angular turns, that is, the number of angular rounds plus the number of years of growth of the untextured corners (about two years), which is equal to the actual age of the cattle.
However, the growth of the angle wheel is also affected by many factors, such as cattle disease, especially chronic diseases, or the feed quality is not suitable, it will have a great impact on the growth and development of the diagonal, easy to cause short and shallow, small angle wheel. In addition, cows need a lot of nutrition during pregnancy and lactation, which can cause the horn tissue to not fully develop, thus deepening the degree of depression of the angle wheel. Therefore, when we use the angle wheel to identify the age, we usually only calculate the large and obvious angle wheel. The small and inconspicuous can not be calculated. In addition, after the birth of the cow in 5~7 days, if the horn is removed, it cannot be based on the angle. Identify age.
The above is the identification method of the age of the cows. As can be seen from the above, the accuracy of the two methods is not very high. Therefore, in the breeding process, every cow should be marked and recorded in order to improve the breeding efficiency. the best solution.
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