First, scientifically arrange the breeding of two-year-old sheep can be breeding in March to April, lambing from August to September; 9 to 10 months of breeding, the following year 2 to 3 months of production of second child. Two-year-old, three-year-old sheep can be bred from August to September and lambs will be born from January to February of the following year. The animals will be bred from March to April in the following year and will be born from August to September in the following year. The breeding will be conducted from October to November in the following year. From March to April, lambs are born again. Second, the estrus over the same period during the same period of estrus is the use of certain hormone preparations artificially controlled, adjust the process of a group of ewes estrus cycle, in order to focus on the estrus in a predetermined time, so that a reasonable organization of breeding. 1, commonly used in the same period of estrus drugs: currently used in sheep estrus drugs in the same period there are generally two categories, one is the inhibition of estrus preparations, is a progesterone substances, such as progesterone, medroxyprogesterone, megestrol, norethindrone , Chloride progesterone, progesterone, 18 methy norethindrone, etc., which maintain a certain level in the blood, can inhibit the growth and development of follicles. The other are gonadotropins that are used in combination with the above drugs, such as follicle stimulating hormone, luteinizing hormone, PMSG, and HCG, and gonadotropin releasing hormone (GNRH) that promotes the release of endogenous gonadotropins. The use of these hormones is to promote the growth and maturation of the follicles and ovulation, to achieve a higher degree of synchronization of ovulation ovulation, and improve the conception rate. 2, the same time the treatment of estrus: The most commonly used is vaginal embolism. Take a piece of foam and pry it on a thin line. The other end of the line leads outside the anus and it is easy to pull out at the end. The foam is immersed in a progestogen preparation solution (mixed with vegetable oil), stuffed with a long handle to the outside of the cervix, and left for 14 to 16 days. The intramuscular injection of PMSG 400-700 international units that day, 2 to 3 days after the majority of ewes were processed estrus, the day of estrus and the next day each insemination. 3, drug types and reference dosage: medroxyprogesterone 40 ~ 60 mg, megestrol ketone 40 ~ 50 mg, 18 megestethonone 30 ~ 40 mg, clomazone progesterone 20 ~ 30 mg, chlorprogesterone 30 ~ 60 mg, progesterone 150-300 mg.
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