The reproductive technology infertility of sheep is mainly caused by the accuracy of estrus identification and mating technology. Since the estrus symptoms of sheep are not obvious, especially the estrus of sheep, the estrus of ewes cannot be detected in time, resulting in missed mating or untimely mating, which causes infertility. Therefore, it is very important to use B-ultrasound for sheep in feeding and management; poor artificial insemination technology, improper semen processing and insemination technology, no pregnancy examination or unskilled examination technology, and failure to detect non-pregnant ewes in time are also the main causes of infertility. It is necessary to use B-ultrasound for sheep to conduct regular pregnancy examinations after mating.

To prevent reproductive technology infertility, we must first improve the level of breeding technology, formulate and strictly follow the system and procedures of estrus identification, pregnancy examination, and mating (artificial insemination). In these processes, B-ultrasound for sheep plays a very important role. Be well prepared for delivery and midwifery, and deal with postpartum diseases in time. In addition, we should vigorously publicize and popularize scientific knowledge about reproduction, promote advanced reproduction technology and improved methods, gradually achieve no missed mating, accurate estrus identification and pregnancy diagnosis, no wrong mating, no missed best mating period, no blind mating, skilled and accurate inspection technology, correct and timely insemination and mating, estrus identification and pregnancy diagnosis, and sheep B-ultrasound can play an important role.

Aging infertility refers to premature aging of ewes that have not reached the anestrus period, and premature decline of reproductive function. Ewes that have reached the anestrus period have lost their reproductive ability due to the decline of their whole body functions, and have lost their value in production. They should be eliminated. Before elimination, it is best to use sheep B-ultrasound to check. The ovaries of aging ewes are small, without follicles and corpora lutea. The uterine horns of multiparous ewes are loose and sagging, and secretions are often retained in the uterus. These phenomena can be clearly seen through sheep B-ultrasound. The uterine horns of ewes with few pregnancies are reduced and shortened. The appearance of such ewes also has aging phenomena. If they are repeatedly infertile, they should be eliminated.

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