When sows are mated, they must record the date of breeding and the breed and ear number of the boars. Once the sow is deemed pregnant, it is necessary to calculate the expected date of production, which is convenient for feeding and management, and is ready for confinement. The sow’s gestation period was 110-120 days with an average of 114 days. Estimation of the sow's expected date of birth is carried out in 114 days, and is usually calculated using the following two methods.
(1) The three-three-three method can be used to remember the sow's gestation period as three months, three weeks and three days.
(2) Adding breeding month 3, breeding day 20 plus 3 for sow breeding months, and 20 for breeding days. The date obtained is the sow’s expected date of production. For example, breeding on February 1st, giving birth on May 21st, mating on March 20th, and giving birth on July 10th.
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