Vaginal embolization (progestin-PMSG method) Place vaginal progesterone release device (CRID) or sponge embolus containing progesterone into the deep vagina of the sheep, while placing intramuscular injection of compound progesterone preparation and place it for 12 days to 14 days ( 12 days in the breeding season and 14 days in the non-breeding season). Simultaneous intramuscular injection of 400IU-750IU pregnant horse serum. The first time of maternal serum treatment 48 hours -56 hours after the first breeding, breeding at the same time static injection of human chorionic gonadotropin or ovulation on the 3rd 25IU-30IU, mating at the same time per milliliter of semen plus 1 unit of oxytocin semen treatment, interval 8 hours After the second mating, they were put into the rams for supplementation. On the 14th day, they were put into the rams and started to be supplemented. The rams were withdrawn in 20 days.
This method is safe and reliable. The first episode is not affected by the fetus, and the second three episodes will normally appear. This will not affect the ultimate conception of the ewe. This method can achieve a estrus rate of over 90% over the same period and is the preferred solution.
Prostaglandin treatment
The entire group of ewes were all injected with 1.2 mg of 15-methyl-prostaglandin for the first time. The ovary had a corpus luteum and was estrus within 72 hours-90 hours after the injection. Insemination could be performed after the estrus. Sheep that did not respond to the first injection were given a second injection 10 days later. During this time, these ewes may respond to the second injection due to the formation of corpus luteum in the ovaries of natural estrus.
The advantages of this method are convenience, the first one is the high cost of treatment; the second is no effect on the ovary without the corpus luteum; the third is invalid during the non-estrus season; the fourth is the misuse of pregnant ewes can cause miscarriage.
Triple Hormone Treatment
Each milliliter of triad hormone contains androgen 25 mg, progesterone 12.5 mg, and estrogen 1.5 mg. Injecting triple hormone into the muscles of adult ewes or first-born ewes, the aphrodisiac effect of triad hormones on ewes was significant, but the first time of conception was low (4%), and the second time of conception was 67. %the above.
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