1. The recipient ewes that are ready for embryo transfer must be healthy, disease-free, have good reproductive performance, have a medium-sized body, and have good sensation. 2. Embryos are harvested 3 to 8 days after the estrus of the donor sheep. The recipient ewes should also receive embryo transfer at the same time. The transplant period cannot exceed the luteal phase, otherwise the embryos are difficult to survive and the transplantation is difficult to succeed. 3. The flushing fluid collected from the donor sheep must be allowed to stand for about 10 minutes. After the embryos subside, the upper fluid is removed and the embryonic development is checked. Embryos cannot be affected by any physical, chemical or biological factors during the inspection process, otherwise their survival rate will be affected. 4. The goat must increase the nutrition level of the recipient ewes before taking the estrus treatment at the same time, and take the excellent feeding aphrodisiac. In the application of hormone estrus control, must understand the specific role of the hormone in advance, to grasp the role of hormones in the sheep's body mechanism, the body condition and physiological conditions of the ewes themselves, can not arbitrarily increase the dose or increase the number of doses, otherwise not only can not be expected The effect will have negative consequences. 5. The ewes should increase the nutrient content of the diet several weeks before the start of the breeding period, which can improve the effect of superovulation, superovulation effect and the heredity, age, body condition, ovarian function, season and the quality of hormones used. The amount of a variety of factors related to a large number of practice has shown that the number of eggs discharged to 10--15 is the best, if the egg is discharged too much, there will often be a trend of low fertilization rate and collection rate. 6. When transplanting by surgery, sedation to the recipient's ewes must be strictly controlled. The two embryos are transplanted to the upper part of the uterine horns or the ampulla of the fallopian tubes, and the movements during the transplantation should be prompt and accurate to avoid damage to the tissues. . 7. Be careful when performing operations on Boer goats to prevent the scalpel from bleeding due to bruising. At the same time, during the operation, the physiological saline with antibiotics should be poured into the abdominal cavity of the sheep to prevent certain organs after surgery. Adhesion occurs. 8. The donor and recipient ewes should not only pay attention to their health status, but also pay attention to whether they are estrus at the scheduled time, and if there is no estrus after the operation, further careful observation is needed. Pregnancy tests are performed on the recipient ewes at appropriate times. If they are indeed pregnant, feeding and management must be strengthened and care should be taken to ensure normal growth and development. China Agricultural Network Editor
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