The initial mating age is an important indicator in dairy cow production. It not only affects the reproductive performance of the cow itself, but also affects the lactation performance and production life. In 2013, I was re-appointed as a technical instructor for the dairy industry in Jinnian County's 2013 Agricultural Technology Demonstration Project. After two years of family guidance, I found that individual dairy farmers did not have a good grasp of the initial age of dairy cows. With age, it is of great significance to improve the quality of herds, give full play to its production performance and increase reproduction rate. Cows reach sexual maturity (usually 16-18 months of age) and are not suitable for mating because sexual maturity is earlier than physical maturity, and the body continues to grow when sexually mature. The initial weight should be 70% (350?) of the mature weight. If the age is reached and the body weight is not reached, the initial age should be postponed. On the contrary, it can be appropriately advanced. It is advisable to reach the weight standard. Early mating of cows will affect their own healthy production development. The calf's physique is weak, and the birth weight is small, so it is difficult to raise the cows. The cow's ability to produce milk is affected; the cows are too late and the feeding costs increase. It is easy to make cows fat and not easy to suffer. Under my guidance, farmers have mastered the basic physiological knowledge of dairy cows, grasped the initial allocation age, and achieved timely breeding.
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