Modern mutton sheep pursue high quality characteristics such as precocity, multiple fertility, rapid growth and development, and good meat quality. Through the research of breeding, hormones, nutrition, etc., there are the following ways to improve fertility: 1. Strengthen breeding and matching: 1. Selection of rams: Choose breeding rams from the ewes with high fertility . 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 multiple litter ewes' offspring, and paying attention to their lactation and breastfeeding performance, can also select multiple ewes based on their families. Second, the use of multi-fetal genes: the introduction of multiple births, hybrids with local breeds, is to improve the fertility of the fastest, most effective and most convenient method. Third, reproductive technology control: 1. Estrus control: 1 Lamb early weaning 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: The ram sensation is introduced 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 400-500IU will be injected. After 30 hours, estrus can be started. Each day and the next day are inseminated. 5 prostate hormone method: Prostaglandins in the uterus during the end of a few days into the uterus or intramuscular injection, can cause estrus estrus in 2-3 days. 2. Superovulation: Four days before the arrival of the oestrus in the ewes, muscle or subcutaneous injections of maternal serum gonadotropins (600-1100 IU), mating after estrus occurs, and intramuscular or intravenous injection of human chorionic gonadotropin (HCG) on the same day. ) 500-750IU, you can discharge eggs. 3. Inducing twin births, multiple births: 1 feeding aphrodisiac law: one month before breeding. 2 Use double lamb or double placenta: There are two kinds of water agent and oil agent, and the water agent product is injected subcutaneously in the neck 5 minutes before the breeding of the ewe and 1 ml each; the oil agent product is 2 weeks before the breeding. An intramuscular injection of 2 ml/only. 4. Adopt advanced insemination technology to increase conception rate.
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TAIZHOU XINGWANG AQUATIC PRODUCT CO., LTD. , http://www.tzxingwang.com