We all know that most of the reproductive organs of ewes are located in the pelvic cavity. The upper, lower and side walls of the body surface are covered by thick layers of muscles and pelvic bones, so it is not suitable to use ultrasound exploration for sheep. The body surface can only be explored backward through the posterior part of the abdominal wall or forward through the perineum; and there is a blind sac behind the rumen inside the left abdominal wall, which is also not suitable for ultrasound exploration. Although the perineum can explore some organs in the pelvic cavity, the field of view is small and of little significance. Therefore, the most suitable exploration path for the body surface is to explore from the posterior part of the right abdominal wall to the posterior and upper part of the opposite side. The full bladder can be used as a sound-transmitting window to scan the reproductive organs near the front opening of the pelvis. It is more suitable to use a 3.5MHz fan-scanning probe. The intracavitary probe can be used for sheep B-ultrasound exploration, while the vaginal probe is mostly used for human gynecological exploration. Based on this, another exploration path can be opened up. According to the characteristics of the equipment used, the 3.5 MHz fan-scanning probe is relatively large, and the sheep's vagina is narrow, so it is not suitable for vaginal exploration. However, the 5.0 MHz linear array probe is relatively small and transmits ultrasound on one side. Most of the reproductive organs of sheep are below the rectum, so using a 5.0 MHz linear array probe with a long handle to scan through the rectum is a very suitable exploration path, and there is little interference when exploring through this path, and the reproductive organs can be directly scanned through the rectal wall. Based on this, two exploration paths for sheep ultrasound machines were determined: using a 3.5 MHz fan-scanning probe to scan from the right posterior abdominal wall to the opposite posterior and superior side, and using a 5.0 MHz linear array probe with a handle to scan downward through the rectum.

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