1. Make the sow productive during the day. At 8 to 9 o'clock in the morning 1 to 2 days prior to the sow's labor, sorogenic alcohol injection of 1 to 2 ml in the neck of the sow can allow 98.2% of the sows to give birth during the day and the survival rate of the piglet will be tested. The former 90% increase to more than 98%.
2. Allow the sows to give birth in the spring and autumn. Sows are arranged in the spring and autumn to avoid cold winters and hot summers. They can increase the survival rate of piglets and achieve 5 births per year. The first child can be arranged for mating from November to December, and will be born from March to April of the following year. The second child will be placed in the breeding season from May to June and the child will be born from September to October.
3. Calculate the expected date of the sow. The normal gestation period of sows is 108-120 days with an average of 114 days. The method for deciding the date of sow's due date is: Adding dates for 3 months plus 3 weeks and 3 days. If the sow mating date is April 10, the expected maternity period is 4+3=7 (months), 10+21 (3 weeks)+3 (days)=34 days, ie August 3.
4. Early sow pregnancy diagnosis. When sows are bred for 3 to 4 weeks, the thumb and index finger press the 9th thoracic vertebra to the 2nd lumbar vertebra. If the back of the spine is slightly arched, the pregnant woman will not conceive.
5. Increase sow farrowing rate. From 3 days after weaning to during estrus, sows are given 400 mg of vitamin B, 400 mg of carotene, 200 mg of vitamin E per head per day, and the dose is halved after being bred. After 3 weeks of feeding, 2 to 2 pigs per litter can be born.
6. Sows artificial aphrodisiac. For sows that have not been estrus for a long period of time, 20 ml of boar semen was used. The seminal fluid was slowly introduced into the uterus of the sow by the vas deferens, and the vas deferens was repeatedly rotated and twitched back and forth, and a small amount of semen was sprayed on the nose of the sow. Strengthen feeding, and estrus can be used for breeding within 4 days. Or the weight of 75 ~ 100kg sow intramuscular injection of chorionic gonadotropin 100 units, or subcutaneous injection of pregnant horse serum 5ml, generally 4 to 6 days to heat.
7. Sows prolactin. Place the sow's postpartum placenta in clean water and cut into small pieces of 4 to 5cm in width and 2 to 3cm in width. Cook over 1 to 2 hours of slow fire and stir the mixture into the gruel. From the 2nd day after childbirth, Feed sows 2 times a day until feeding. The sows that have been suffering from lack of milk have been fed with 30g of wood, angelica 20g, and 30g of astragalus decoction, which are fed together with cooked tires.
Author: Shiyan Application Science and Technology School, Danjiangkou City, Hubei Province
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