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Related Experiment Video

Updated: May 1, 2026

Using Chronic Social Stress to Model Postpartum Depression in Lactating Rodents
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Social sham chewing in sows?

Claes Anderson1, Linda Marie Backeman Hannius1, Daiana De Oliveira1

  • 1Department of Animal Environment and Health, Swedish University of Agricultural Sciences, P.O. Box 7068, Uppsala 75007, Sweden.

Behavioural Processes
|April 28, 2024
PubMed
Summary
This summary is machine-generated.

Researchers observed frequent chewing behavior in sows interacting with unfamiliar pigs. This chewing, previously linked to hunger, may be a novel social behavior in pigs.

Keywords:
Animal welfareDisplacement behaviourMixing of sowsPig behaviour

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Area of Science:

  • Animal Behavior
  • Ethology
  • Swine Science

Background:

  • Chewing behavior in sows is typically associated with oral stereotypies and chronic hunger.
  • Previous research has not described chewing in a social context within pig populations.

Purpose of the Study:

  • To describe and analyze an unusual chewing behavior observed in group-housed dry sows during social interactions.
  • To investigate the potential social context and underlying reasons for this previously undescribed behavior.

Main Methods:

  • Observation of group-housed dry sows during a study on social abilities and damaging behaviors.
  • Detailed recording and analysis of chewing instances during inter-sow interactions.

Main Results:

  • Chewing behavior without an edible substrate was frequently observed.
  • The behavior was performed by nearly all sows involved in social interactions with unfamiliar conspecifics.

Conclusions:

  • The observed chewing behavior in sows may represent a previously unrecognized social behavior.
  • Further research is needed to understand the function and triggers of this behavior in a social context.