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Calcium mobilisation in hypomagnesaemic cattle.

P A Contreras, R Manston, B F Sansom

    Research in Veterinary Science
    |July 1, 1982
    PubMed
    Summary

    Hypomagnesaemia, a state of low magnesium, significantly reduces calcium mobilization rates in both steers and lactating cows. This finding is crucial for understanding metabolic disturbances in cattle.

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    Area of Science:

    • Veterinary Medicine
    • Animal Physiology
    • Biochemistry

    Background:

    • Hypocalcemia is a critical metabolic condition in cattle.
    • Magnesium plays a vital role in calcium homeostasis.
    • The impact of hypomagnesaemia on calcium mobilization requires further elucidation.

    Purpose of the Study:

    • To investigate the effect of hypomagnesaemia on calcium mobilization rates.
    • To compare calcium mobilization in normomagnesaemic and hypomagnesaemic states in cattle.
    • To assess potential differences between steers and lactating cows.

    Main Methods:

    • Induction of hypocalcemia using ethylenediaminetetraacetic acid (EDTA) infusions in cattle.
    • Measurement of calcium mobilization rates under normomagnesaemic and hypomagnesaemic conditions.
    • Inclusion of both steers and non-pregnant lactating Friesian cows in the study.

    Main Results:

    • Mean calcium mobilization rate in normomagnesaemic steers was 0.32 mmol/min, reduced to 0.21 mmol/min in hypomagnesaemic steers (P < 0.005).
    • Mean calcium mobilization rate in normomagnesaemic cows was 0.41 mmol/min, reduced to 0.26 mmol/min in hypomagnesaemic cows (P < 0.02).
    • Hypomagnesaemia significantly decreased calcium mobilization in both animal groups.

    Conclusions:

    • Hypomagnesaemia impairs the body's ability to mobilize calcium.
    • This effect is consistent in both male (steers) and female (lactating cows) cattle.
    • Findings highlight the importance of maintaining adequate magnesium levels for calcium metabolism in livestock.

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