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Related Experiment Videos

Pickle barrels as enrichment objects for rhesus macaques.

S M Lehman1, R G Lessnau

  • 1Department of Anthropology, Washington University, St. Louis, MO 63130-4899.

Laboratory Animal Science
|August 1, 1992
PubMed
Summary
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Pickle barrels significantly enhanced social behaviors in rhesus monkeys (Macaca mulatta) by increasing affiliative contact and social grooming. These barrels provided enrichment, particularly for younger and older individuals, across both sexes.

Area of Science:

  • Primate behavior
  • Animal enrichment
  • Ethology

Background:

  • Rhesus monkeys (Macaca mulatta) are a common model species in biomedical research.
  • Enrichment strategies are crucial for maintaining psychological well-being in captive primates.
  • Understanding social dynamics and object interaction is key to effective environmental enrichment.

Purpose of the Study:

  • To investigate the impact of pickle barrels as an enrichment object on the behavior of rhesus monkeys.
  • To compare affiliative and agonistic behaviors between rhesus monkeys in an enriched environment and a control group.
  • To determine patterns of pickle barrel usage across different age and sex classes.

Main Methods:

  • Observation of two breeding groups of rhesus monkeys in outdoor enclosures over 84 hours.

Related Experiment Videos

  • Utilized instantaneous scan sampling of focal animals to record behaviors and barrel interactions.
  • Categorized behaviors (agonistic, affiliative, grooming) and barrel use (type, arrangement).

    • Main Results:

    • Animals in the enriched environment showed significantly higher rates of affiliative contact (60.8%) and social grooming (62.2%).
    • Pickle barrels, particularly swivel and stationary types, were frequently used (55% of scans).
    • Yearlings, juvenile females, and old males exhibited disproportionately high barrel usage (82.8% of scans).

    Conclusions:

    • Pickle barrels serve as effective enrichment objects for rhesus monkeys, promoting positive social interactions.
    • Enrichment via pickle barrels benefits younger and older individuals across both sexes.
    • Differential usage patterns suggest specific age/sex classes derive greater utility from this enrichment.