Infertility is caused by congenital defects or diseases in the reproductive organs of ewes. Abnormal structural abnormalities in the reproductive organs of ewes, such as vaginal atresia, poor cervical opening, lack of cervix, double cervix, underdeveloped uterus, blocked fallopian tubes, etc., prevent semen from passing through the ewe's reproductive tract smoothly to the fertilization site, and prevent the combination of sperm and egg, resulting in infertility. Therefore, it is necessary to use sheep ultrasound to examine the ewe's reproductive organs.

Inflammation of the reproductive organs caused by bacterial and viral infections, chronic wasting diseases such as parasites inside and outside the body, etc., can lead to poor physical development in sheep, long-term inability to estrus, and loss of reproductive ability. It is necessary to use B-ultrasound to examine the condition of the reproductive system in sheep.

There are many factors that can cause infertility in ewes due to endocrine disorders. The most common ones are that ewes consume artificial feed or grass containing hormones, such as compound feed containing estrogen and growth hormone, or ewes consume estrogen containing plants such as clover. While accelerating the growth rate of ewes, long-term and excessive feeding can also cause endocrine disorders in ewes, leading to infertility or temporary inability to conceive. Through B-ultrasound examination, the development of ewe follicles can be observed.

Excessive or insufficient body size of the ram, or an imbalance in the ratio of male to female sheep, where a ram with an excessive body size mates with a ewe that is too small or a ram with an excessive body size mates with a ewe, can result in mating failure if the ewe is unable to follow the ram's weight or if the ram's penis cannot reach the ewe's reproductive organs during mating.

In the case of free mating between mixed herds of male and female sheep, this phenomenon is often overlooked by breeders, and there are no other suitable male sheep for mating in the flock, which often leads to some ewes missing the opportunity to conceive lambs. It is necessary to frequently use sheep ultrasound to check the pregnancy status of their ewes. The proportion of male and female sheep is too small, and the workload of male sheep during the breeding season is heavy, which can lead to low libido and decreased semen quality, and also cause some female sheep to miss opportunities.

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