Induced estrus in ewe. Most sheep give birth every year and have a long anestrus period after birth. If the estrus induction treatment is carried out in the anestrus period, the B-ultrasound examination of sheep can shorten the lambing interval and make the ewe give birth to 3 piglets in 2 years.

Ewe birthing control. Although the practice of simultaneous estrus breeding has been able to make the birth time of ewes relatively concentrated and orderly, but prostaglandins and their analogues (such as cloprostenol) have the characteristics of stimulating uterine and fallopian tube contraction, which can play the role of oxytocin, so after treatment, sheep should be examined with B-ultrasound. Prostaglandin 15mg or cloprostenol 15mg were injected intramuscularly into pregnant ewes after 140 days of gestation. At least 50% of ewes give birth within 40 hours, allowing for a more concentrated delivery of pregnant ewes at the same time, but the uterus should be checked regularly after delivery using a sheep B-ultrasound.

Technique of inducing double lambing of ewe. For sheep with low lambing rate, double lambing can be induced by genetic selection, gonadotropin, reproductive hormone immunity, embryo transfer and nutritional regulation, and B-ultrasound examination should be carried out in the process of treatment.

Embryo transfer in ewes. Excellent adult ewes aged 2.5-5 years with high production performance and genetic breeding value were selected as donors. Sheep should be examined by B ultrasound, and the recipient sheep should be selected as soil breeding sheep or other sheep without infectious diseases and reproductive diseases, physical health, and normal estrus. Donor sheep and recipient sheep were treated with simultaneous estrus, and embryos were collected from uterus and fallopian tubes on days 6-7.5 or 2-3 of estrus, respectively.

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