After entering the fetal stage of embryonic development, the internal organs of the small tailed Han sheep have basically formed various anatomical structures in the body. Although they can gradually increase in size, mature, and function with the progression of pregnancy, their anatomical location has been basically determined as early as the fourth week of pregnancy. The vast majority of fetal internal organs can be displayed by sheep using B-ultrasound, which mainly depends on the reflectivity of anatomical structures, the resolution of sheep using B-ultrasound instruments, and the exploration techniques used by Sheep Using B-ultrasound. Anechoic structures are mostly fluid containing organs, displayed as liquid dark areas, such as cardiovascular, bladder, gastrointestinal, etc., belonging to multiple anatomical systems. Medium or low echo structures are often found in solid organs such as the liver, kidneys, and brain. As the fetus develops, their appearance in animal B-ultrasound images also undergoes a process of change. It is not until the middle and late stages of pregnancy that they gradually exhibit echo characteristics similar to adults. Sheep B-ultrasound clearly displays the edges of various organs. In addition, fetuses have some anatomical structures that are different from adults, and mastering these characteristics is also beneficial and necessary for exploring the internal organs of fetuses.

Sheep B-ultrasound machine BXL-M2

The early appearance of various organ tissues in the fetus of small tailed Han sheep is relatively late due to the frequency of using B-ultrasound probes in sheep. The use of a 3.5MHz veterinary B-ultrasound probe in the middle and late stages of pregnancy increases the scanning range and reduces resolution. At the same time, precisely because the scanning range of the sheep's B-ultrasound probe is larger than that of the 5. OMHz veterinary B-ultrasound probe, when many organs have exceeded the scanning range of the 5. OMHz veterinary B-ultrasound probe, the veterinary B-ultrasound probe can still function well to monitor the development of various organs in the later stages of pregnancy.

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