B-ultrasound diagnostic method for cattle is a physical inspection method that closely combines the physical properties of ultrasound and the acoustic characteristics of the animal's tissue structure. Taking the veterinary A-ultrasound in the cattle B-ultrasound as an example, the detection method is as follows: the probe insertion depth is generally 30-50 cm. It is deeper in multiparous cows than in young cows, and deeper in those with longer gestation periods than in those with shorter gestation periods. Veterinary A-ultrasound detects fetal heart sounds or fetal blood sounds deeper than uterine blood sounds. When performing random detection, a rectal examination is used for comparison to determine whether the pregnancy is present. The following sounds can be detected in early pregnant dairy cows: uterine blood sounds (blood flow sounds in the middle artery of the mother's uterus) are similar to "ah, ah" and "cicada chirping" sounds, which indicate pregnancy. The frequency is synchronized with the mother's heart sounds, is rhythmic, and the sound is vibrating and elongated. If it sounds like "hu-hu-", it means there is no pregnancy; the fetal heart sound is like the sound of horse hooves. It is a rhythmic double beat sound of "dongdong" and "pudong, pudong". In the early stage of pregnancy, it is a single beat or "rustling" sound, which is weak and the rhythm is not obvious; fetal blood sound (fetal arterial blood flow sound and umbilical arterial blood flow sound) is a single beat sound, with a high and sharp pitch, rhythmic, and a "beep" sound, which is completely synchronized with the fetal heart sound; fetal movement sound is like a dog barking sound, irregular, and increases with the increase of pregnancy date. Three Doppler signals such as uterine blood sound, fetal heart sound and fetal blood sound are the basis for early pregnancy diagnosis. As long as one of these three signals is obtained, pregnancy can be confirmed.

B-ultrasound for cattle

At present, some large-scale dairy farms use veterinary B-ultrasound instruments for early pregnancy diagnosis of dairy cows. B-ultrasound for cattle has many advantages in the diagnosis of early pregnancy in dairy cows, such as early diagnosis time, intuitive and reliable B-ultrasound images for cattle, early diagnosis, early treatment, and shortened fetal spacing. Reduce some potential losses. During the examination, the feces in the rectum must be taken out first. The probe is then inserted into the anus and slowly pushed into the deep rectum, the depth of which depends on the cow's body size and month of gestation.

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