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Related Experiment Videos

Evidence that bears are induced ovulators.

William R Boone1, Becky B Keck, Jeffery C Catlin

  • 1Reproductive Endocrinology & Infertility, Greenville Hospital System, 890 W Faris Road, Suite 470, Greenville, SC 29605, USA. bboone@ghs.org

Theriogenology
|March 24, 2004
PubMed
Summary
This summary is machine-generated.

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Black bears are induced ovulators, meaning ovulation is triggered by mating. This study found that female black bears exposed to males ovulated, unlike isolated females, aiding ursid reproduction strategies.

Area of Science:

  • Reproductive biology
  • Mammalian reproduction
  • Ursid research

Background:

  • Induced ovulation is common in some mammals but not well-documented in ursids.
  • Understanding black bear reproductive physiology is crucial for conservation and captive breeding.

Purpose of the Study:

  • To investigate whether the American black bear (Ursus americanus) exhibits induced ovulation.
  • To determine the role of male exposure in triggering ovulation in female black bears.

Main Methods:

  • A controlled experiment with two replicates, exposing female black bears to males or isolating them.
  • Ovarian examination via laparoscopy to identify corpora lutea.
  • Measurement of serum progesterone levels to assess reproductive status.

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Main Results:

  • Seven of eight females exposed to males ovulated, forming one to four corpora lutea.
  • Six of seven isolated females did not ovulate.
  • Significantly lower progesterone concentrations were observed in isolated females compared to those exposed to males.

Conclusions:

  • The American black bear is likely an induced ovulator.
  • Male presence or mating stimulus is critical for ovulation in this species.
  • Findings can inform captive breeding programs for bears and other ursids.