In sheep pregnancy monitoring, an important aspect is the judgment of the number of pregnant fetuses. The application of real-time sheep B-ultrasound technology is safer, faster and more accurate than any other technology. It can also be said that this is a more powerful application of sheep B-ultrasound, because it is more difficult than pregnancy diagnosis. The operator needs to have certain experience. In the late pregnancy, the nutritional level of the ewe is directly related to the birth weight of the fetus. Therefore, the pregnant sheep are divided into different groups according to the number of fetuses they are pregnant with, and the corresponding feeding plan is formulated accordingly. It can not only reduce the feeding cost, maintain the milk production of the ewe, and ensure the growth and development of the lamb after birth, but also avoid fetal asphyxia and pregnancy toxemia caused by improper feeding. There are usually two ways to distinguish between ewes with single and multiple fetuses. One is to count the number of fetuses seen. The other is to make a quick judgment by using the fact that the volume of the liquid uterus in the uterus of ewes with multiple fetuses is more and larger than that of ewes with single fetuses of similar size. In large-scale breeding farms, in order to save time, people generally use the latter method. Using B-ultrasound to determine the number of fetuses is the most economical and effective method.

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