[Kidney function in calves in the neonatal period. I. Studies of the capacity to store electrolytes Na, K, Cl, Ca, Mg and Pn].

The capability of the kidneys of 12 bull-calves at the age of 7-35 days of life to save electrolytes Na, K, Cl, Ca, Mg, Pn were examined. The examinations were made with the clearance methods using inulin as the indicator of the glomerular filtration of plasma. It was proved, that as the calves grow and develop, there arise changes in the glomerular filtration, tubular resorption and in the excretion of the examined minerals in urine. There was observed, at the same time, the relatively stabile level of these electrolytes in blood. It shows the functional development of the calves kidneys and the fact, that in the proper environmental conditions and particularly at the proper feeding, the kidneys are able to maintain the favorable, from the point of view of the internal balance and the needs of the developing organism, level of the electrolytes.