Conducting a portable B-ultrasound screening for sheep when selecting donors and recipients can save direct economic losses. Both donors and recipients for sheep embryo transplantation must be non-pregnant ewes of reproductive age with healthy reproductive tracts. When purchasing donor sheep and a large number of recipient sheep directly from other places, their physical conditions are not known and it is difficult to identify them by visual inspection. Conducting a portable B-ultrasound screening for sheep can eliminate pregnant sheep and sheep with abnormal reproductive tracts, and reduce the economic losses caused by abortion of pregnant sheep and waste of drugs caused by drug treatment. For example, a sheep farm did not conduct a B-ultrasound examination on the recipient dairy goats before treatment. As a result, 76 of the 300 recipient goats aborted, all of which were first-generation Boer goat hybrids, resulting in a direct loss of more than 30,000 yuan, and affecting the progress of this embryo transplant. The nearby Tianye sheep farm conducted a B-ultrasound screening before treatment, and found 24 pregnant goats (Boer×Boer hybrids) among 108 recipient goats, and 2 pregnant goats among 11 donor Boer goats. After the pregnant sheep were isolated and raised, the smooth progress of this embryo transplantation was ensured, and 26 lambs were saved, saving more than 40,000 yuan of direct economic losses.

Portable Sheep B-ultrasound monitoring of donor superovulation effect can reduce the economic losses of donors caused by surgery. At present, donor sheep are mostly operated to flush embryos, and surgery may cause the reproductive tract of donor sheep. The estimated effect was abandoned. In the past, the superovulation effect of donor sheep was observed during surgery and the number of corpora lutea was directly counted. The author used portable sheep B-ultrasound monitoring during superovulation treatment. Before the operation, the development of ovaries and follicles was seen from various cross-sections of the ovaries, the development of follicles and corpora lutea was monitored, and the number of ovulations was estimated. On the one hand, the number of recipient sheep and transplanted embryos can be reasonably matched according to the estrus records of the donor and recipient; on the other hand, for those sheep with poor superovulation effect and less than 5 corpora lutea, no surgery is performed and they are allowed to conceive naturally. This not only reduces the risk of surgery, but also increases the number of natural pregnancies of donors.