1. Increase the proportion of fertile ewes. Every year, we must rectify our flock, eliminate aged sheep and infertile sheep in time, and leave young rams and ewes that are not used for breeding, so that the proportion of educated ewes can reach more than 70%. The larger the proportion, the greater the number, and the more beneficial it is to increase the reproduction rate. 2. Strengthen feeding management. Prior to mating, it is necessary to grasp the summer and autumn harvest, increase nutrition, and increase the weight before mating, so that the ewes will be in neat heat, the quantity of ovulation will be increased, and the quality will be improved. The breeding rate, conception rate and multiple births will be improved. Intensive feeding and management during pregnancy, especially during late pregnancy, can reduce the rate of miscarriage, stillbirth, and mortality in ewes. Lambs have a large initial weight. Strengthen feeding and management during lactation, can increase the ewe's lactation force, the lamb's growth and development are fast, and the survival rate is high. 3. Select to keep multiple ewes and their lambs. The number of lambs that chose to stay in the 1-2th litter with more lambs was higher in terms of the number of subsequent litters, and the number of lambs born after their selection was retained. The future multiple births were also high. This is an important way to improve multi-nature. 4. Lambing frequently. Ewes who breed all year round must shorten their nourishment period so that the ewes produce 1 lamb at intervals of 6 to 7 months, 1 at 2 or 2 at 3 times, and the lambs can be weaned earlier, from 4 to 2 months. - Weaning for 3 months to allow ewes to be escorted early. It is also possible to appropriately advance the initial age of the ewes, which will increase the number of lambs born to the ewes throughout their lives. Frequent lambing is an effective way to increase the number of lambs, but feeding and management must be strengthened for both ewes and lambs. 5. Import multiple lambs blood. The selection of multiple-breasted rams to be bred to ewes of single-family cultivars results in multiple litters for future generations, which can increase subsequent lambing rates. Within the same breed, it is also true to use multiple rams for breeding sheep. 6. Drug aphrodisiac. With reproductive hormone drugs, the ewes are treated according to certain procedures to make them estrus within a predetermined period of time. The currently simpler and more applicable method is the use of prostaglandin drugs. Treatment of estrus using prostaglandins involves the use of a single injection of PGF 6-8 mg (or 2aICI 80996 30-50 mg) to the ewes and 50% to 60% of the estrus in the ewes within 72 hours after injection. Another method is to increase the proportion of estrus at the same time by more than 80% after the first injection at intervals of 11 days at the same dose. (Injection of prostaglandins can lead to miscarriage of pregnant ewes. Therefore, special attention must be paid. Prevent injection of pregnant ewes). 7. Drugs promote superovulation. Reproductive hormones (such as maternal serum gonadotropin - PMSG, pituitary cytosine - PSH and ovulation hormone - HCG, etc.) are used for superovulation treatment of elite ewes. The ovary can excrete more mature eggs in the estrus cycle than in the natural state, and then the ewes are treated with bred sheep or frozen sperm for timely mating. 8. Timely breeding and multiple breeding. Short-term maturation of the estrus should be done in a timely manner to prevent leakage. Practice has proved that after the start of the mating season, the fertility rate of the 1-2 season is the highest, and the rate of twins born to the lamb is also high. Some high-yielding ewes have many ovulations, but they are not matured at the same time, but they are discharged one after another. Therefore, multiple breeding or insemination should be carried out. Repeated mating, double mating and mixed insemination can be used to fertilize eggs that have been discharged. Opportunity can increase lambing rate.
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