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Related Experiment Videos

Hematology values from clinically healthy Peromyscus leucopus.

P J Wu1, E H Greeley, L G Hansen

  • 1Department of Pathobiology, College of Veterinary Medicine, University of Illinois, Urbana 61802, USA.

Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians
|April 5, 2000
PubMed
Summary

Hematocrit and white blood cell (WBC) counts in Peromyscus leucopus show minimal age-related differences. Young mice had higher neutrophils, while females had more WBCs and lymphocytes at 4 weeks.

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Area of Science:

  • Veterinary Hematology
  • Rodent Physiology
  • Comparative Immunology

Background:

  • Hematological parameters are crucial for assessing animal health.
  • Understanding age and sex variations in these parameters is vital for accurate interpretation in research models.
  • Peromyscus leucopus is a common model organism in ecological and biomedical research.

Purpose of the Study:

  • To determine age-related and sex-specific differences in hematocrit and white blood cell (WBC) counts in Peromyscus leucopus.
  • To establish baseline hematological data for healthy white-footed mice across different age groups.
  • To identify potential variations that could influence research outcomes.

Main Methods:

  • Collected blood samples from 132 clinically healthy Peromyscus leucopus.

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  • Analyzed hematocrit and total and differential WBC counts.
  • Categorized mice into four age groups (4, 5-8, 9-20, and >32 wk old).
  • Compared hematological values between age groups and sexes.

    • Main Results:

    • Minimal overall differences in hematocrit and WBCs were observed across age groups.
    • Neutrophil counts and percentages were significantly higher in 4-week-old mice.
    • Lymphocyte percentages were significantly lower in 4-week-old mice compared to 9-20-week-old mice.
    • Females at 4 weeks showed higher WBC and lymphocyte counts; males in older groups had higher hematocrits.

    Conclusions:

    • Age has a limited impact on most hematological parameters in Peromyscus leucopus.
    • Early-life (4-week-old) mice exhibit distinct neutrophil and lymphocyte profiles.
    • Sex influences hematocrit and WBC counts in specific age brackets, particularly in younger and older mice.