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Integrating Reference Intervals into Chimpanzee Welfare Research.

Jessica C Whitham1, Katie Hall1,2, Lisa K Lauderdale1

  • 1Chicago Zoological Society-Brookfield Zoo, 3300 Golf Road, Brookfield, IL 60513, USA.

Animals : an Open Access Journal From MDPI
|February 25, 2023
PubMed
Summary
This summary is machine-generated.

Researchers established reference intervals for chimpanzee welfare indicators. Age and sex impact social grooming and aggressive behaviors, but not diversity or key physiological markers.

Keywords:
animal welfarebehavioral diversityglucocorticoidsimmunoglobulin-Areference interval

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Area of Science:

  • Primate welfare research
  • Animal behavior studies
  • Veterinary science

Background:

  • Enhancing the quality of life for chimpanzees in professional care requires robust welfare indicators.
  • Non-invasive, animal-based measures are crucial for systematically monitoring chimpanzee physical, mental, and emotional states.

Purpose of the Study:

  • To establish species-specific reference intervals for behavioral and physiological welfare indicators in captive chimpanzees.
  • To identify age and sex-related differences in these welfare measures.

Main Methods:

  • Analysis of behavioral data and fecal samples from 40 adult chimpanzees across 16 zoological facilities.
  • Generation of reference intervals for behavioral states, diversity, fecal glucocorticoid metabolites (GCMs), and fecal immunoglobulin-A (IgA).
  • Linear regression models used to compare sex and age differences.

Main Results:

  • Social grooming decreased with age; males exhibited more aggressive and display behaviors than females.
  • Males engaged in sexual examination behaviors more frequently than females.
  • No significant variations in behavioral diversity, fecal GCM, or fecal IgA were found based on sex or age.

Conclusions:

  • Established reference intervals provide benchmarks for assessing individual chimpanzee welfare.
  • Age and sex are significant factors influencing specific chimpanzee behaviors.
  • These findings support evidence-based management decisions for captive chimpanzees.