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Related Experiment Video

Updated: Aug 3, 2025

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle
09:05

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle

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The Track-by-Day Method for Monitoring the Rodent Estrous Cycle.

Gianna M Raimondi1,2, Rebecca Tripp1, Linnaea E Ostroff1,2,3

  • 1Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut.

Current Protocols
|April 11, 2023
PubMed
Summary

Tracking the estrous cycle in female rats is crucial for neuroscience research. A new "Track-by-Day" method simplifies vaginal smear analysis, making cycle staging accessible for all researchers.

Keywords:
estrous cyclefemale subjectssex differencesvaginal cytology

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Area of Science:

  • Neuroscience
  • Reproductive Biology
  • Animal Models

Background:

  • Female subjects are increasingly included in preclinical neuroscience research.
  • Ovarian hormones can influence brain function, necessitating estrous cycle monitoring.
  • Current methods for estrous cycle staging are complex and lack standardization.

Purpose of the Study:

  • To introduce a simplified and standardized method for monitoring the estrous cycle in rats.
  • To overcome barriers to entry for researchers new to estrous cycle tracking.
  • To improve consistency and comparability of research findings.

Main Methods:

  • Collection and staining of vaginal smears.
  • Classification of vaginal smears using the "Track-by-Day" protocol.
  • Preparation of slides for smear analysis.

Main Results:

  • The "Track-by-Day" method provides a streamlined approach to estrous cycle monitoring.
  • The protocol is simple to implement and ensures consistent reporting.
  • This method demystifies and facilitates the adoption of cycle tracking.

Conclusions:

  • The "Track-by-Day" method enhances accessibility and standardization of estrous cycle tracking in rats.
  • This simplified approach supports the routine inclusion of female subjects in neuroscience research.
  • Consistent cycle monitoring is vital for reliable and reproducible preclinical studies.