Let the sow be born during the day 1 to 2 milliliters of the prostaglandin injection in the neck of the sow from 1 am to 2 days before the sow's perinatal birth, enabling 98.2% of the sows to On the next day of childbirth, the survival rate of piglets increased from 90% before the test to more than 98%. The sows were allowed to sow in the spring and autumn to sow the sows in the spring and autumn. They avoided the severe winter and hot summer and improved the survival rate of the piglets to achieve 5 births per year. The first child can be placed between November and December, and the baby is born from March to April the following year. The second child is scheduled to breed from May to June and the child is born from September to October. It is easy to calculate that the sow's normal gestation period for sows during the pre-production period is 108 days to 120 days, with an average of 114 days. The method for calculating the expected date of the sow is to add the date of the breeding plus 3 months plus 3 weeks and 3 days. If the sow mating date is April 10, the expected mating period is 4+3=7 (months), 10+21 (3 weeks)+3 (days)=34 days, ie August 3. When the sow is diagnosed with a sow during the first trimester of pregnancy by 3 weeks to 4 weeks, the thumb and index finger press the 9th thoracic vertebra to the 2nd lumbar spine. If the back of the sow is slightly arched, the conception will be conceived. The dorsum of the sow will not be conceived. Raising the sow's farrowing rate The sows are fed 400 mg of vitamin B, 400 mg of carotene, 200 mg of vitamin E, and halved the dose after breeding every 3 days after weaning, and then fed for 3 weeks. Tiller 2 is prolific.