Thirty cows with parturient paresis were divided into three groups of 10. All the cows were given 500 ml of a 40 per cent calcium borogluconate solution intravenously over a period of 10 minutes, and 20were also given 500 ml of a 10 per cent solution of sodium phosphate intravenously; in 10 of the cows this solution was administered over a period of 10 minutes immediately after the calcium borogluconate solution, and in the other 10 cows 200 ml of the solution was administered rapidly and the remaining 300 ml was added to 10 litres of sodium chloride and glucose solution and infused slowly over six hours. There were no significant differences between the groups with respect to the outcome of the treatments; six or seven of the cows in each group stood within eight hours of the treatment. There were no significant differences between the changes in serum calcium concentrations among the groups. The mean concentrations of inorganic phosphorus in the groups given sodium phosphate were increased above the normal range initially, but after eight hours there were no significant differences between the groups in terms of the numbers of cows that were hypophosphataemic. There were no significant differences between the three groups with respect to changes after treatment in the serum concentrations of magnesium or parathyroid hormone.
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