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Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice

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Enrichment and individual differences affect welfare indicators in squirrel monkeys (Saimiri sciureus).

Genevieve N Izzo¹, Meredith J Bashaw, John B Campbell

¹Department of Psychology, Franklin & Marshall College.

Journal of Comparative Psychology (Washington, D.C. : 1983)

|July 20, 2011

Summary

Environmental enrichment can improve captive animal welfare, but less enrichment increased negative behaviors in squirrel monkeys. Individual differences in behavior are crucial for accurate welfare assessment.

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Area of Science:

Animal Welfare Science
Primate Behavior
Environmental Enrichment

Background:

Measuring captive animal welfare is challenging, particularly regarding individual differences.
Environmental enrichment aims to enhance animal well-being by modifying captive habitats.

Purpose of the Study:

To investigate the impact of varying environmental enrichment levels on welfare indicators in Guyanese squirrel monkeys.
To assess how individual differences influence responses to enrichment and welfare measurements.

Main Methods:

Five enrichment levels were created by manipulating food presentation, walkways, and toys.
Welfare indicators were measured across conditions, including a novelty test with an unfamiliar person.
Behavioral changes were analyzed using repeated-measures MANOVA and rank correlations.

Main Results:

Lower enrichment levels increased negative welfare indicators (abnormal behavior, aggression, negative novelty response).
Higher enrichment levels sometimes decreased negative indicators, with slight increases in positive novelty responses.
Consistent individual differences were observed in novelty responses and aggression rates.

Conclusions:

Environmental enrichment's effect on welfare indicators is complex and depends on the level of enrichment.
Individual behavioral consistency necessitates considering specific animals when selecting welfare indicators.
Enrichment goals and species-specific factors should guide welfare indicator selection and interpretation.