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Intravascular granulocyte kinetics in developing calves.

G P Carlson, J J Kaneko

    American Journal of Veterinary Research
    |April 1, 1975
    PubMed
    Summary
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    Intravascular granulocyte kinetics in calves show age-dependent changes. Younger calves exhibit larger granulocyte pools and faster turnover rates compared to older calves, approaching human values.

    Area of Science:

    • Veterinary Medicine
    • Hematology
    • Immunology

    Background:

    • Understanding granulocyte kinetics is crucial for assessing immune function in developing animals.
    • Previous studies have not comprehensively detailed intravascular granulocyte kinetics in calves across different age groups.

    Purpose of the Study:

    • To determine intravascular granulocyte kinetic values in normal developing calves.
    • To compare these values across different age groups and with human data.

    Main Methods:

    • Utilized chromium radioisotope (51Cr) to label granulocytes in calves aged 8 to 365 days.
    • Conducted 15 kinetic trials to measure granulocyte clearance from circulation.
    • Analyzed data using exponential function to determine kinetic parameters.

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    Main Results:

    • Granulocyte clearance followed an exponential function.
    • Older calves (≥180 days) showed kinetic values similar to humans, with a mean clearance half-life (T1/2) of 8.9 hours.
    • Younger calves (8-16 days) had larger total blood granulocyte pools and shorter intravascular half-lives, resulting in a higher granulocyte turnover rate (39.91 x 10^8/kg/day).

    Conclusions:

    • Calf granulocyte kinetics are age-dependent, with significant differences between young and adult animals.
    • Kinetic values in older calves approximate those found in humans.
    • These findings provide a baseline for evaluating immune status and potential disorders in calves.