Under confinement conditions, where swine have limited possibilities to avoid or escape from their aggressors, fighting can be injurious to pigs and therefore deleterious to both health and welfare. Aggression is a normal part of the biology of the pig and can occur at low levels throughout all phases of production. Piglets naturally begin to fight immediately after birth to establish a dominance order based on teat location. At the time of weaning piglets and regrouping of unacquainted pigs, fighting can initially occur to establish a hierarchical order. Fighting may continue if resources are perceived to be limited.[1] Certain forms of aggression can be deleterious. During farrowing, the newborn piglet can face potential savaging and cannibalism by the sow. Although the original function of such behavior is defense of the sow's own piglets, it can be a practical problem when the behavior is directed either at the caretaker or at the piglets themselves.

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