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Studies on calcium and magnesium metabolism in ruminants part 2 effect of continual intra venous infusion of calcium lactate on serum concentration and urinary excretion of calcium magnesium phosphorus sodium and potassium in sheep



Studies on calcium and magnesium metabolism in ruminants part 2 effect of continual intra venous infusion of calcium lactate on serum concentration and urinary excretion of calcium magnesium phosphorus sodium and potassium in sheep



Journal of the Faculty of Agriculture Iwate University 14(2): 119-130



Hypercalcemia was induced in 4 Corriedale ewes, by continual i.v. infusionof calcium calcium lactate (Ca: 3.75mg/kg of body wet per h) for 8 h. Serum concentration of Ca significantly rose from 8.41 to 14.10mg/dl at the end of the period of infusion (P < 0.001). The urinary excretion of Ca also increased from 0.023 to 0.246 mg/kg body wt (kg for short) per h, or the largest value, over the period of infusion (P < 0.001). A significantly positive correlation was found between the serum Ca level and the urinary excretion of Ca (P < 0.001). The urinary excretion of Mg significantly increased from 0.25 to 0.67 mg/kg per h, or the largest value, over the period of infusion (P < 0.01). The serum concentration of Mg significantly fell from 2.60 to 1.92 mg/dl by the end of the period of infusion (P < 0.001). The urinary excretion of P significantly decreased from 0.245 to 0.024 mg/kg per h by the end of the period of infusion (P < 0.001). The serum concentration of P tended to fall a little over the period of infusion. A significant positive correlation was found between the urinary excretion and the serum level of P (P < 0.05). The urinary excretion of Na increased from 0.081 to 0.205 meq/kg per h, or the largest value, over the period of infusion. The serum concentration of Na significantly fell from 152.1 to 148.0meq/l by the end of the period of infusion (P < 0.001). The urinary excretion of K significantly decreased from 0.167 to 0.065 meq/kg per h by the end of the period of infusion (P < 0.001). Thus the serum concentration of K did not change over the period of infusion. A significant negative correlation, however, was found between the urinary excretion and the serum level of K (P < 0.05). A significant negative correlation was found between the serum level of Ca and that of Mg, P or Na (P < 0.001). Moreover, there were significant negative correlations between the urinary excretion of Ca and that of P (P < 0.05) and between that of Ca and that of K (P < 0.01). A significant positive correlation was present between the urinary excretion of Mg and that of Na (P < 0.001) and between the urinary excretion of P and that of K (P < 0.001). A decrease in the secretion of parathyroid hormone and an increase in the secretion of calcitonin, which was caused by a rise in the serum concentration of Ca, might make the urinary excretion of Mg increase and induce hypomagnesemia readily in ruminants.

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Studies on calcium and magnesium metabolism in ruminants. II. Effect of continual intravenous infusion of calcium lactate on serum concentration and urinary excretion of calcium, magnesium, phosphorus, sodium and potassium in sheep. Journal of the Faculty of Agriculture, Iwate University 14(2): 119-130, 1978

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