[Vitamin A-vitamin D3 relationship in growing rats]

A relation vitamin A - vitamin D3 exists in diet for growing rats. When this decreases from 5 (microgram A - IU D3) or 15 (IU A - IU D3) to 1,25 (microgram/IU) or 3,75 (IU/IU) growth, calcemia are increasing but vitamin A hepatic storage is decreasing. In other words for a same quantity of retinol, cholecalciferol's level in diet determines hepatic stores of vitamin A. General aspect of this question is discussed.