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Related Experiment Videos

Apparatus for measuring rat body volume: a methodological proposition.

Rodrigo Hohl1, Renato Buscariolli de Oliveira, Denise Vaz de Macedo

  • 1Departmento de Bioquímica, Universidade Estadual de Campinas, Campinas, Brasil.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 4, 2006
PubMed
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A new communicating-vessels system accurately measures live rat body volume using hydrostatic weighing. This inexpensive, reliable method eliminates the need for anesthesia or fur shaving, simplifying animal research.

Area of Science:

  • Physiology
  • Biomedical Engineering
  • Animal Science

Background:

  • Accurate body volume measurement is crucial for physiological and metabolic studies in animal models.
  • Traditional methods can be invasive, time-consuming, or require anesthesia, potentially affecting results.
  • A reliable, non-invasive method for determining body volume in live rats is needed.

Purpose of the Study:

  • To develop and validate a communicating-vessels system for measuring body volume in live rats.
  • To assess the accuracy, reproducibility, and reliability of the hydrostatic weighing apparatus.
  • To determine if anesthesia or animal movement affects volume measurements.

Main Methods:

  • A communicating-vessels system utilizing water level detection via hydrostatic weighing was designed.

Related Experiment Videos

  • System calibration was performed using known volumes of water and aluminum cylinders.
  • Live Wistar rats (anesthetized and non-anesthetized) underwent volume measurements (n=90).

    • Main Results:

    • The system demonstrated high linearity (R(2) = 0.99999) with minimal bias (<1 ml) and low errors (0.01-0.07%).
    • Differences in volume measurements between anesthetized and non-anesthetized rats were negligible (0.31 ± 2.34 ml).
    • Animal movement did not significantly interfere with volume measurements.

    Conclusions:

    • The proposed communicating-vessels system provides an accurate, reproducible, and reliable method for measuring rat body volume.
    • The apparatus is inexpensive and does not require anesthesia or fur shaving, simplifying experimental procedures.
    • This method is suitable for various scientific applications requiring precise body volume determination in live rodents.