To improve the success rate of artificial insemination, in addition to timely breeding, the author believes that the following three issues should be noted: 1, insemination in place. When artificial insemination, the vas deferens must be slowly inserted along the upper wall of the vagina, and it must be rotated and pushed through the cervix and into the uterus. The insertion depth of the vas deferens is 23 to 30 cm (depending on the size of the sow). If it is too deep, the degree of sperm acquisition is not enough, it is not easy to conceive, and there are few litters. If it is too shallow or it enters the urethra, it is more difficult to suffer fetus. The speed of injection of semen should be appropriate, and it is better to finish the injection slowly. 2. Avoid sunlight, electric light, etc. In short, semen needs darkness. 3, the semen treatment. Collect, dilute, and store semen as required. The sperm motility of the semen should not be less than 9. The amount of insemination should be between 30 and 40 ml (based on 40 ml). Before insemination, the semen should be slowly warmed to about 35°C. If the transfusion device is boiled and sterilized, it should be completely cooled and then inseminated. When the gilts are estrus, the vulva is red and swollen, with a slight shrinkage, fibrinous mucus flow out, and the first time breeding is done when the back of the sow is standing still. After a period of 4 hours to 6 hours The second breeding, to do the third safe breeding at around 7:30 the next morning. Some sows relapsed during pregnancy after mating. In order to avoid this situation, you can use a bottle of 800,000 units of penicillin and dilute it with 20 ml of cold boiled water about 1 hour before mating, and then enter it like an artificial insemination after 1 hour. By producing sows, 7 days postpartum to the breeding stage, more feeds containing protein are fed to promote normal estrus after lactation and weaning and to increase the number of ovulation, which is beneficial to breeding.
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