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Urinary Estradiol in Captive Bonobos: Variation With Reproductive State and Sexual Swelling.

Sara Cotton1, Klaree Boose1,2, Sedona Espstein1

  • 1Department of Anthropology, University of Oregon, Eugene, Oregon, USA.

American Journal of Primatology
|May 14, 2025
PubMed
Summary
This summary is machine-generated.

Urinary estradiol (E2) monitoring in bonobos is validated for reproductive research. Estradiol levels accurately reflect pregnancy and correlate with sexual swelling in cycling females, aiding health and behavior studies.

Keywords:
apesendocrinologyestradiolreproductionsexual swelling

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Area of Science:

  • Primate reproductive endocrinology
  • Behavioral ecology
  • Conservation physiology

Background:

  • Estradiol plays a crucial role in reproductive and behavioral functions.
  • Monitoring estradiol is complex due to influencing factors and sample size challenges.
  • Urinary estradiol offers a non-invasive method for reproductive status assessment in primates.

Purpose of the Study:

  • To validate the use of opportunistically collected urinary estradiol levels for reproductive monitoring and behavioral research in bonobos (Pan paniscus).
  • To assess the relationship between urinary estradiol concentrations and reproductive status (pregnancy, lactation, cycling).
  • To investigate the correlation between urinary estradiol and visual cues of sexual swelling in bonobos.

Main Methods:

  • Analysis of frozen urine samples from four adult female bonobos over four years.
  • Measurement of urinary estradiol and creatinine concentrations.
  • Statistical analysis to compare estradiol levels across reproductive states and correlate with sexual swelling and other factors.

Main Results:

  • Urinary estradiol levels were significantly higher in pregnant compared to non-pregnant females.
  • No significant difference in estradiol levels was found between lactating and regularly cycling females.
  • A significant positive regression was observed between urinary estradiol and sexual swelling size in cycling females.

Conclusions:

  • Opportunistically sampled urinary estradiol, when combined with visual observation, can effectively detect changes in bonobo reproductive status.
  • The transition from lactational amenorrhea to estrogen cycling may be less distinct than anticipated.
  • Visual assessments of sexual swelling provide valuable information on relative estradiol levels in bonobos, despite potential ovulation masking.