Observe the sow frequently for signs in the days before farrowing.
Three Looks and One Squeeze
First Look: Udders. The sow’s udders are enlarged and shiny before giving birth, and the nipples on both sides swell and separate outward in a figure-eight shape.
Second look: The base of the tail. Before giving birth, the sow’s tail base sinks on both sides, the vagina is loose, and the labia are red and swollen.
Three observations: Behavioral manifestations: Prepartum sows usually begin to show signs of restlessness 24 hours before delivery, frequent turning over and changing lying postures, loss of appetite, mucus coming out of the vulva, and frequent urination, usually 6- --Delivery is due in 12 hours.
One squeeze: If the front nipple can express milk, you can give birth 24 hours later. If you squeeze the middle nipple, you can give birth 12 hours later. When the last pair of nipples can express milk, it must be within 4-6 hours. childbirth. Pressing lightly with your fingers on any teat will squeeze out a lot of milk and the sow will soon give birth.
The amniotic fluid breaks, indicating that the sow is about to give birth.