Modern mutton sheep pursue high quality characteristics such as precocity, multiple fertility, rapid growth and development, and good meat quality. Through research on breeding, hormones, nutrition, etc., there are several ways to increase fertility:
First, strengthen breeding, matching
1 ram selection: Choose rams from the high fertility ewes. Body shape is required to be standard, robust, testicles are well developed, male characteristics are obvious, and rams that do not meet the requirements are found and eliminated through measures such as semen quality inspection and identification of descendants.
2 Ewe selection: Selecting excellent individuals from the multiple litter ewes offspring and paying attention to their lactation and breastfeeding performance, or selecting multiple ewes based on their families.
Second, the use of multiple birth genes
The introduction of multiple-breeding breeds that hybridize with local breeds is the fastest, most effective, and easiest way to increase fertility.
Third, reproductive technology control
1 estrus control: 1 The early weaning of lambs is conducive to the implementation of two-year-old technology. 2 hormone treatment: first weaning the lamb, and then hormone treatment of ewes for about 10 days, after stopping the injection of pregnant horse serum, gonadotropin (RMSG), can cause estrus and ovulation. 3 Biological stimuli: Introduce ram cuteness mainly by adjusting the light cycle and breeding season. 4 Vaginal sponge method: Place the sponge impregnated with progestogen on the cervix and handle it for 10 to 14 days. After injection, pregnant goat serum gonadotropin 400 to 500 IU will be injected. After about 30 hours, estrus can begin. Each day and the next day are inseminated. 5 Prostate Hormone Act: Prostaglandins are poured into the uterus for several days after the end of estrus or intramuscularly and can cause estrus in the ewes within 2 to 3 days.
2 superovulation: 4 days before the arrival of the ewes in the ewes, muscle or subcutaneous injection of maternal serum gonadotropin 600 ~ 1100IU, immediately after the occurrence of estrus breeding, and on the same day muscle or intravenous injection of human chorionic gonadotropin (HCG) 500 ~ 750IU, you can discharge eggs.
3 Inducing twin births, multiple births: 1 Supplementary aphrodisiac method: one month before breeding. 2 The use of double lamb or digester: There are two kinds of water agent and oil agent, and the water agent product is injected subcutaneously once every 5 weeks and 2 weeks before the ewes are mated; 1 ml/body is subcutaneously; the oil agent product is 2 weeks before the seeding An intramuscular injection of 2 ml/only.
4 Adopt advanced insemination technology to increase conception rate.
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