[A contribution to the relationship between electric systole and hypocalcemia in cattle]

Strong correlations between electric systole (QT time) and calcium-serum concentration can be statistically secured. In this context, all-transistor direct-printing electrocardiographs were used for indirect determination of calcium concentrations with the view to assessing QT time. The approach is described with reference to the need for safe and independent diagnosis of hypocalcaemic hysteroparalysis in concomitance with parturition against the background of industrialised cattle farming.