First, adjust the heat (1) Lambs early weaning. Early weaning is beneficial to the implementation of 2-year-old technology. Lamb early weaning can shorten the lactation period of the ewes so that the ewes will be in early estrus and shorten the lamb's lambing interval to control the breeding cycle of the ewes. (2) Hormone treatment. The specific approach is: first weaning the lamb, and then hormone treatment of ewes for about 10 days, after stopping the injection of pregnant horse serum gonadotropin, can cause estrus estrus and ovulation. (3) Biological stimuli. This includes changing environmental conditions and applying sex hormones. The main measure is to adjust the light cycle and introduce rams before the mating season begins. (4) Vaginal plug sponge. The progesterone-soaked sponge is placed at the cervix of the ewes and treated for 10 to 14 days. After each injection of 400 to 500 international units of maternal serum gonadotropins, the ewes begin to estrus. Each insemination on the day and the next day. Commonly used progestogens and each injection dose: Progesterone 150-300 mg, Megestrol 50-70 mg, Methedone 80-150 mg, 18 Methy norethindrone 30-40 mg, Progesterone 20-40 mg . (5) Oral progesterone. Progesterone is evenly mixed into the feed and fed for 12 to 14 days. The progestogen dosage is 1/10 to 1/5 of the vaginal plug sponge method. On the day of the last medication, the intramuscular injection of pregnant hormone serum gonadotropin 400 to 750 IU. (6) Perfusion of prostaglandin hormones. Implantation of prostaglandin into the ewe's uterus or intramuscular injection can cause estrus in the ewes within 2 to 3 days. Second, supernumerary ovulation 4 days before the estrus of the adult ewes, that is, 12 or 13 days of the estrus cycle, muscle or subcutaneous injection of maternal serum gonadotropin 600 ~ 1100 international units, to be estrus mating immediately after the estrus, and On the same day of muscle or intravenous injection of human chorionic gonadotropin 500 to 750 international units, the ewes can discharge several or even more than 10 eggs. Third, induced twin births, multiple births can be induced by intramuscular injection of double lamb or digester ewes produce twins, multiple births. There are two types of water- and oil-based additives: If water products are selected, they can be injected subcutaneously in the neck 5 weeks before and 2 weeks before the breeding of the ewes. Each injection of 1 ml can be used. If oil products are used, the ewes can be used 2 weeks before the breeding of the ewes. One intramuscular injection, 2 ml per injection.
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