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  • Title: Comparison of the daily endogenous faecal magnesium excretion from sheep eating grass with high sodium or high potassium concentrations.
    Author: Powley G, Care AD, Johnson CL.
    Journal: Res Vet Sci; 1977 Jul; 23(1):43-6. PubMed ID: 905653.
    Abstract:
    Metabolism trials were conducted with two sheep to determine the daily endogenous faecal magnesium excretion and the true magnesium availability of grass which had either a high potassium or a high sodium content. The experiment was conducted as a simple cross-over design and the isotope dilution technique using 28Mg was employed. The sheep ate sodium fertilised grass containing 0-73 per cent Na and 1-55 per cent K and potassium fertilised grass containing 0-15 per cent Na and 3-12 per cent K in the dry matter. The daily endogenous faecal magnesium excretion was not found to be significantly different for each sheep on both grasses; this excretion was approximately 13 per cent of the total faecal magnesium output. The true availability of magnesium was greater in the sodium fertilised grass than in the potassium fertilised grass. It was concluded that the daily endogenous faecal magnesium excretion was not affected by altering the herbage levels of sodium and potassium.
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