25-OH-D3 Concentrations in serum from healthy and paretic post parturient cows

The serum 25-OH-D₃, Ca, P, and Mg concentrations in thirty-seven cows that had calved in March April were studied in this trial. Twenty-three had puerperal paresis. Values observed in this group were Ca, 1.27 ± 0.3 mmol/l, P, 1.63 ± 0.82 mmol/l, Mg, 1.14 ± 0.27 mmol/l, and 25-OH-D₃, 32.7 ± 22 μg/l. In the fourteen age-matched healthy control cows from the same herd values were Ca, 1.93 ± 0.5 mmol/l, P, 3.09 ± 1.28 mmol/l, Mg, 1.01 ± 0.3 mmol/l and 25-OH-D₃, 31.5 ± 19.7 μg/l. The range of values for the cows serum 25-OH-D₃ concentration was l't; 3.2 to 76 μg/l. No differences could be established in terms of 25-OH-D₃ concentrations between the groups.