1. Sows are hungry or malnourished. The long-term feed alone, lack of feeding, lack of protein, minerals, vitamins and other nutrients, coupled with hunger, resulting in the behavior of sow food piglets. This situation is more common in thin old sows or primiparous sows.
2. Eater evil. Sows who have ever eaten a litter of piglets or odor-free piglets, or have swallowed tire-bearing clothing, aborted fetuses, and developed piglets' filth.
3. Can't drink water in time. Sows are highly stressed during the process of piglets production. Breathing is rapid, and fetal water is lost, which leads to thirst. If the water is not filled in time, the sow’s mood is impatient and biting piglets will occur.
4. Pain and fear. Some of the first-born sows had not seen piglets and thought that the piglets would hurt themselves and have fear. When the sow sees the piglet, she often has large eyes and is ready to attack. Once the piglets are close, they are either killed or bitten. In some cases, the sows are difficult to produce and suffer from pain. Often the pain is vented to the piglets, killing the piglets.
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