Any disease will directly or indirectly affect the reproductive performance of dairy cows, among which reproductive diseases are particularly prominent. The main reproductive diseases of dairy cows are ovarian diseases and uterine diseases, which can be diagnosed through imported cattle B-ultrasound.

Ovarian diseases mainly include ovarian cysts, persistent corpus luteum and ovarian inactivity, etc. These diseases can inhibit the estrus and ovulation of dairy cows, thereby affecting the breeding and conception rate of dairy cows. Therefore, it is necessary to diagnose these diseases through imported cattle B-ultrasound; uterine diseases are mainly endometritis, which can affect the conception rate of dairy cows. Uterine diseases can also be clearly diagnosed through imported cattle B-ultrasound.

Diseases other than reproductive diseases can also affect the performance of dairy cows' reproductive performance, such as limb and hoof diseases can reduce the reproductive performance of dairy cows, and mastitis can induce endometritis, etc. Therefore, producers should be meticulous and meticulous in every link of production, always adhere to the principle of "prevention is more important than treatment", strengthen feeding management and environmental sanitation and disinfection, and avoid and reduce the occurrence of various diseases. At the same time, it is also necessary to detect and treat various diseases early, so that dairy cows can recover as soon as possible, ensure that the normal production performance of dairy cows is fully exerted, reduce economic losses, and ensure economic benefits.

Generally speaking, the main reasons for the elimination of dairy cows are reproductive system diseases, breast diseases, digestive system diseases, hoof diseases, and heterosexual twin deformities. Among them, digestive system diseases and reproductive system diseases are the main reasons for the elimination of dairy cows, and imported Cow B-ultrasound can be used as an auxiliary diagnostic method. The elimination due to digestive system diseases and metabolic diseases mostly occurs in the early lactation period (within 60 days), the elimination due to breast diseases and hoof diseases mostly occurs in the early lactation period (within 15 days), and the elimination due to reproductive system diseases mostly occurs in the late lactation period (within 350 days).

Therefore, the feeding management of dairy cows during the peripartum period should be strengthened in production, and imported cow B-ultrasound examinations should be used frequently to reduce the proportion of passive elimination of dairy cows. Inferior dairy cows with rough temperament, overly sensitive nerves, older age, diseases or disabilities, reduced production performance, and poor breeding performance should be eliminated in time.

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