Reproduction is one of the main functions of dairy cows and a key link in their production. The purpose of running a good cattle farm is to generate profits by producing more cows; The second is to add value and expand the group. To achieve the above objectives, a high level of reproductive performance is required as the foundation, and high-level reproductive management cannot be separated from scientific reproductive management.

The average number of days a cow is not pregnant refers to the period between 80 to 100 days after giving birth to a calf, during which the cow's reproductive system has fully recovered and is ready for the next pregnancy; The average number of estrus days after delivery refers to the period within 40 days of calving in cows. If it exceeds this period, imported cows should be used promptly for B-ultrasound examination of their condition;

The monthly breeding rate of non pregnant cows after more than 60 days postpartum refers to the fact that 80% of cows with more than 60 days postpartum need to be bred each month, and pregnant cows account for 42-52% of the total breeding population; The average number of days for the first mating after giving birth refers to the period of 40-60 days after a cow gives birth, during which mating indicates that the uterus of the cow in this pasture has recovered well after giving birth. The pregnancy rate of less than 3 mating cycles refers to the proportion of cows that become pregnant within 3 mating cycles after giving birth; The ratio of estrus interval of 18-24 days refers to the time from the current estrus to the next estrus of a cow, which indirectly indicates that the health status of the cows in this pasture is good.

Therefore, standardized management of dairy cows is essential for dairy farms. The effective use of imported bovine ultrasound technology in the breeding process of cows is an important task, and the correct use of imported bovine ultrasound can improve the reproductive rate of cows.

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