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Calcium balance in laboratory rabbits.

S L Buss, J E Bourdeau

    Mineral and Electrolyte Metabolism
    |January 1, 1984
    PubMed
    Summary

    Female New Zealand White rabbits exhibit higher plasma calcium levels and urinary calcium excretion than other mammals. These findings are based on a study of their calcium balance and renal handling under standard laboratory conditions.

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    Area of Science:

    • Nephrology
    • Comparative Physiology
    • Animal Nutrition

    Background:

    • Understanding calcium homeostasis is crucial for metabolic and renal research.
    • Mammalian renal calcium handling varies significantly across species.
    • New Zealand White rabbits are a common model organism in physiological studies.

    Purpose of the Study:

    • To quantify calcium balance in growing female New Zealand White rabbits.
    • To investigate the renal handling and excretion of calcium in this species.
    • To compare their calcium metabolism to other mammalian models.

    Main Methods:

    • Metabolic balance study in female New Zealand White rabbits.
    • Measurement of plasma total and ultrafiltrable calcium concentrations.
    • Analysis of urinary and fecal calcium excretion.
    • Calculation of fractional calcium excretion.

    Main Results:

    • Rabbits were in positive calcium balance, indicating growth.
    • Excreted calcium was nearly equally divided between urine (47%) and feces (53%).
    • Mean plasma total calcium was 3.32 mM, with 67.9% ultrafiltrable.
    • Fractional urinary calcium excretion was 44.9% of filtered calcium.

    Conclusions:

    • New Zealand White rabbits maintain positive calcium balance during growth.
    • They exhibit higher plasma calcium concentrations than typically reported for other mammals.
    • Elevated fractional urinary calcium excretion suggests distinct renal calcium handling mechanisms.

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