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Related Experiment Videos

Hematologic values in hypothermic and rewarmed young calves.

D P Olson, P J South, K Hendrix

    American Journal of Veterinary Research
    |April 1, 1983
    PubMed
    Summary

    Cold stress in young Holstein calves causes a temporary drop in leukocytes, mainly neutrophils. Upon rewarming, leukocyte counts rapidly increase across all types, especially neutrophils.

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    Area of Science:

    • Veterinary Hematology
    • Neonatal Calf Physiology

    Background:

    • Cold stress is a significant challenge for neonatal livestock, impacting physiological parameters.
    • Understanding hematologic changes during hypothermia and rewarming is crucial for calf health management.

    Purpose of the Study:

    • To investigate hematologic value alterations in Holstein bull calves subjected to cold stress and subsequent rewarming.
    • To differentiate between direct cold effects and physiological responses during hypothermia and recovery.

    Main Methods:

    • Holstein bull calves (1-7 days old) were cold-stressed via water immersion to induce a 10°C core body temperature drop.
    • Calves were maintained in hypothermia for 1 hour before undergoing one of three rewarming methods or natural recovery.
    • Hematologic values, including leukocyte counts, erythrocyte counts, hemoglobin, and packed cell volume (PCV), were monitored.

    Main Results:

    • Leukocyte counts showed a linear decrease during cooling, primarily due to neutropenia, indicating leukopenia.
    • Erythrocyte counts, hemoglobin, and PCV showed minor increases, while mean corpuscular values remained stable.
    • A rapid, linear increase in total leukocytes, particularly neutrophils, was observed during the rewarming phase across all groups.

    Conclusions:

    • Cold stress induces a transient leukopenia in neonatal calves, mainly affecting neutrophils.
    • Rewarming triggers a significant and rapid rebound in leukocyte populations, essential for recovery.
    • These findings highlight the dynamic hematologic response of calves to cold challenges and rewarming protocols.

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