In the case of normal and natural mating, a boar can breed with multi -headed sows, while a sow can only be breeded with 1-2 boars. It can be seen that boars are much more important than sows.If the excellent boar is fully utilized, it will bring ideal benefits to farmers.And pig’s artificial insemination technology can make the use of pigs more fully exerted.
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1. Ejaculation time
The length of the sows’ weaning to estrus is closely related to the length of the estrus and the length of the estrus, and the ovulation time.The longer the estrus time, the shorter the estrus duration, the more advanced ovulation time; the shorter the weaning to the estrus time, the longer the estrus duration, the more the ovulation time.Therefore, the sow should be adjusted according to the estrus of the sow.
1. The sow with estrus 3 to 4 days after weaning, first transfusion for the first time 24 hours after its static response, the second time the sperm seminated for 18-24 hours.
2. The sow with estrus for 5 to 7 days after weaning, 8 to 12 hours after the static response, the secondary infusion was performed from 12 to 18 hours.
3. Sow and reserve sow with estrus for more than 7 days after weaning, immediately infusion after reaction after standing, and the second time the section of 12 hours is 12 hours.
4. The sow who injected hormone estrus, immediately infusion after reacting the reaction, and the second time the interval is 8 to 12 hours.
5. Under normal circumstances, 26 ~ 30 hours after the sows have the symptoms of estrus, they can perform a static response, and ovulation starts at 38 to 41 hours. Generally, the eggs have fertilized ability within 6 hours after discharge.The survival is about 24 hours. Therefore, the first transfusion should be performed 8 to 12 hours after the sow reaches a static response, and the semi -infusion time is about 3 ~ 5 minutes at a time interval for 12 hours to prevent semen from flowing.
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Second, infusion operation
1. Clean the sow’s vulva, tail roots and hips, rinse the disinfection pussy with 1%potassium permanganate solution, and then wet the towel or dry paper towel with warm water to clean the sow pussy.
2. Remove the disposable vasters from the plastic bag and apply lubricating oil or a little pig semen on the head of the vastered pipe.
3. Gently insert a tube in a slight direction in the direction, and rotate in a counterclockwise direction.
4. Continue to insert human vasters until the top of the vollar pipe is "locked" at the cervical part. The depth of the tubing pipe is 23 ~ 30 cm (depends on the size of the sow).There are fewer people; if it is too shallow or entering the urethra, it is more difficult to conceive.
5. Take out the ejaculation bottle or bag from the insulation box, gently rotate and shake it gently to mix the semen, and open the lid.
6. Put the spermist tube of the semen, and try to raise the semen to make the semen flow into the sows through the vastrus pipe.
7. Touch the sow’s abdomen, breast, vulva or press the back of the sow to stimulate the sow uterine contraction to cause negative pressure to suck the semen into the body.over.
8. After the spermistor is completed, twist out the sperm bottle, bend the rear section of the vollar tube, let the vastrus pipe stay in the body for another 30 seconds, and then gently pull out the vasal pipe, and press the sow hips for a while to prevent the semen from flowing.
9. If the voyential pipe is pulled out and the sponge head is left in the sow, the sow should be marked as a mark. After the sow, the sponge head will be discharged out of the body.
3. Improve the method of fetal fetal fetal fetus and childbirth rate
1. Control the time of the initial allocation and accurately grasp the timing of the breeding.
2. Repeat the breeding.The second breeding is performed for 8 to 12 hours after the first breeding.
3. Mixed dual breeding.By mixed with the same variety or 2 pig semen in different varieties, or each time the interval is 1 to 2 hours, it is breed once every 1 to 2 hours.
4. Make sure whether the breeding is successful in time.Embrogy (hexoline, sodium hexyate) can be injected under the skin of the 16th and 17th day after the breeding. Those who do not show estrus sows within 5 days after injection are for pregnancy sow.Test.
5. Strengthen the supply of sows, minerals, and vitamins, eliminate mildew and pollution feed, and often add fungxin+hepatobiliary particles+Qizhen to increase particles to ensure that the environmental temperature of the breeding environment is suitable, quiet, and clean.
6. Add the oxytocin of 5 ~ 10 units in the pig essence; or 4 to 6 hours before the breeding.
Author: Li Chongbin, a senior veterinarian of the Animal Disease Prevention and Control Center of Laibin City
Luo Xihua, Laoshu and Aquatic Technology Promotion Station, Liangtang Town, Xingbin District, Laibin City
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