Vitamins are microelements which do not play a critical role in animal feed formulation, mainly because of their commercial availability in the synthetic form at relatively low prices (the cost of vitamin A in a feed supplemented to 10,000 IU/kg is about 30 centimes per 100 kg). Although real vitamin deficiencies are now overcome, the economic consequences of slight undersupply are not well known. Two experiments were carried out at the AEC experimental farm to study the hepatic storage of vitamin A in piglets. The first methodological study enabled to determine the dynamics of hepatic storage of vitamin A in the piglet and to appreciate the hierarchy of depletion. In the second experiment, lobe 3 of the middle lobe was chosen to study the hepatic storage of vitamin A according to the source and dosis.
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