Improper treatment of reproductive diseases in dairy cows and abuse of exogenous hormones. Due to the influence of feeding environment conditions and unreasonable combination of feed nutrients, many dairy cows are often nutritionally inestrus or infertile. However, some farmers do not start from improving feeding management and adjusting nutritional structure, but frequently use large doses of hormone drugs to arouse estrus, which disrupts the normal hormone regulation function of dairy cows and causes repeated infertility. Therefore, after taking some measures, veterinary B-ultrasound should be used for examination, and the next step should be taken after veterinary B-ultrasound examination.

When the uterus is not flushed properly, it is important to change the veterinary B-ultrasound examination in time. The production of dairy cows is a natural law, and the uterus can be naturally purified and restored after delivery. As long as the calving process of dairy cows is smooth and the placenta is discharged normally, it can be self-purified about 15 days after delivery, and there is no need for uterine flushing. Only when dystocia, retained placenta, and uterine involution are blocked, it is necessary to flush according to the uterine involution situation, but after uterine flushing, veterinary B-ultrasound should be used to check its condition. However, some farmers often start to infuse the uterus with large doses of liquid medicine for uterine flushing on the third day after calving, which destroys the intrauterine environment, prolongs the uterine recovery time, and postpones the time of postpartum estrus and pregnancy.

The identification and insemination time of dairy cows are not accurate. In dairy farming communities, due to the small number of inseminators and the lack of work responsibility, dairy farmers usually observe the estrus themselves and then notify the inseminators to inseminate. Farmers often have an inaccurate grasp of the estrus time of dairy cows, either notifying too early or too late, so that the inseminators cannot inseminate at the best time. Of course, the best way is to determine the breeding time through veterinary B-ultrasound examination.

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