Using a portable veterinary B-ultrasound instrument to identify and measure the ovarian structure of dairy cows can accurately determine the physiological status of dairy cows. If uterine inflammation is not found in most cows during postpartum veterinary B-ultrasound examination, routine examinations can be canceled and individual cows identified as suffering from uterine inflammation can be handed over to veterinarians for treatment. If multiple uterine inflammations are found during prenatal examinations, routine examinations need to be restarted.

 In prenatal veterinary B-ultrasound examination, under normal circumstances, there should be a pseudocorpus luteum and an estrus line in the uterus, and significant follicles in the ovaries. If the diameter of the follicle is less than 5 mm, or if a pseudocorpus luteum is found in the uterus, it indicates that the cow is in interestrus and needs to be evaluated for health and body condition. In body condition scoring, veterinary B-ultrasound ultrasound can also be used to examine and measure back fat and abdominal fat thickness.

 During the breeding period, veterinary B-ultrasound review of unfertilized cows can not only confirm the correct estrus cycle of cows, but also help early diagnosis of diseases such as follicles and corpus luteum cysts. After each veterinary B-ultrasound examination, the size and position of the uterine structure are recorded, which can clearly demonstrate the changes in the uterine structure. The timing of veterinary B-ultrasound testing is 14-28 days after calving; 35-49 days before insemination; monthly testing during the breeding period and before fertilization; pregnancy diagnosis is 28-35 days after insemination.

 After artificial insemination, early pregnancy diagnosis can be carried out before the second estrus (36-48 days after fertilization), which can screen out non-pregnant cows and serve as key observation objects. In veterinary B-ultrasound examination, the viability of the fetus can be judged by identifying the fetal heartbeat and the integrity of the fetal membranes. Early pregnancy diagnosis cannot ensure that the fetus will make it to the uterus, but it can identify twins, a major risk factor for miscarriage. By recording the number and position of the corpus luteum on the ovary, the number of fetuses can be determined. If you have twins in the same uterine horn, the likelihood of miscarriage is 4 times greater than if they are in different uterine horns. Twin detection provides a basis for feeding management. Body condition should be monitored in a timely manner, or transitional diets should be fed as early as possible to meet excess energy needs. Veterinary B-ultrasound review should be performed again after 90 days of pregnancy. Twins have the potential to cause postpartum illness and subsequent poor fertility. Early diagnostic identification and appropriate management can help prevent these problems.

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