Mineral deficiency or imbalance can cause infertility in ewes. Calcium indirectly affects reproduction, and phosphorus participates in energy metabolism, bone development and milk production, so it is closely related to reproduction. During the breeding process, sheep need to use B-ultrasound to check their reproduction frequently. Selenium deficiency mainly causes reduced fertility, and iodine participates in the synthesis of thyroid hormone, so it affects sheep reproduction through the synthesis of thyroid hormone. A better way to solve mineral deficiency in sheep production is to let the sheep lick freely in the playground or sheep house, and conduct separate tests and B-ultrasound tests on their reproductive systems. Ordinary cattle farmers cannot do this. Mineral addition can solve this problem.

Protein is the material basis of life. It can be used as an enzyme that is a catalyst for the body's metabolism, hemoglobin that transports oxygen, antibodies that participate in immunity, and hormones that regulate metabolism. Dietary protein level plays an important role in the reproduction of ewes. Protein deficiency can affect estrus, conception and pregnancy, directly or indirectly affect the reproduction of ewes, and can also cause delayed ovulation in the first estrus period of ewes and prolong the empty period of mature ewes. Too high a protein level can also have an adverse effect on fertility. When protein is deficient, Sheep B-ultrasound can be used to conduct regular examinations to see if there are any abnormalities in the reproductive system. In addition, feeding high-protein feeds will increase the ammonia content in the rumen, which will be toxic to the embryo and may have other adverse effects on fertility. When ewes are about to enter the breeding period, sheep B-ultrasound should be used for observation frequently. The protein in the ewe's daily diet should be appropriately increased, and protein should be added to the ewe during supplementary feeding to stimulate estrus. In Heilongjiang Province, after the ewes are bred, the autumn harvest is over. The ewes can be driven into the bean stubble field after the autumn harvest, which can not only supplement a large amount of protein, but also a large amount of fat and energy, saving feed, which is very beneficial for supplementing protein and energy.