The functions of dairy cow B-ultrasound diagnostic instruments are becoming increasingly powerful. The application of dairy cow B-ultrasound in dairy cow reproduction is becoming more and more extensive. The research on dairy cow B-ultrasound in the examination of dairy cow reproductive organs has also made great progress. The application of dairy cow B-ultrasound in the examination of dairy cow reproductive organs mainly adopts the dairy cow B-ultrasound rectal exploration method. Compared with the traditional rectal examination method, the dairy cow B-ultrasound rectal exploration method has the characteristics of simple operation and easy mastery, no damage to the body, high accuracy, etc., which has great advantages.

Dairy cow B-ultrasound can detect the ovulation of dairy cows. Ultrasound scanning of the ovaries of 8 young cows before and after estrus. If there are mature follicles in the previous examination and disappear in the second examination, ovulation occurs. Then there is corpus luteum development at the same point.

Ultrasound can be used to determine the presence of corpus luteum on the third day after ovulation. The ultrasound image of the developing corpus luteum is an irregular gray-black structure, and its reflection points are all in the ovary. The mid-term corpus luteum is a regular granular black structure with a visible demarcation line. The demarcation line is not obvious in the degenerated corpus luteum. The corpus luteum with cavity is mainly distributed in the non-reflective area and is surrounded by the gray corpus luteum structure. The shape of these cavities changes with the corpus luteum, which is a normal state.

There are many reports on the application of cow B-ultrasound to study cow ovarian cysts. This is mainly because the interior of the cystic follicle or cystic corpus luteum is filled with fluid, and the volume is significantly larger than the normal structure. It appears as a large regular anechoic dark area on the cow B-ultrasound image, which is very easy to distinguish from the surrounding tissue structure. The diagnostic accuracy is quite high. The conformity rate of ultrasound examination of corpus luteum cysts is 92.6%, and the conformity rate of examination of follicular cysts is 75%.

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