Abstract
In this study, the present authors first carried out oral experiments of vitamin D_3 with rabbits and the urinary volume and calcium output were estimated. The excretion of vitamin D_3 in the animals following the administration of vitamin D_3 in quantity in excess of the compound normally ingested was studied. The urinary vitamin D_3 was not demonstrated in lipid-soluble form but the vitamin was found in water-soluble conjugated form. In parallel experiments urinary sulfate and uronate levels were tested. The findings have 1ed to assume that there may be urinary excretion of vitamin D_3-conjugates in animals following the administration of vitamin D_3
