In pigs, empty chewing occurs under certain conditions in pig production and is characterized by chewing movements without food or other material in the mouth. Side effects of chewing empty can be sucking, teeth grinding and increased saliva production with foam formation. Under certain circumstances, the behavior disorder can develop into a stereotype . The phenomenon is often observed in the case of sows in the crate or tethered area , as well as in the case of fattening pigs in the housing without litter . Employment deficits in connection with eating or looking for food are assumed to be the cause. Chewing empty can be prevented with measures for a more species-appropriate keeping , such as the use of litter or activity material. Other pig behavior disorders that result from similar causes include bar biting , grieving, and weaving. Animal rights organizations such as the Albert Schweitzer Foundation for our fellow world criticize that the disturbances in factory farming are accepted for higher productivity.
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