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[Influence of vitamin A deficiency on thyroxinemia in the rat].

During the 9 post-weaning weeks there is not in the vitamin A-deficient Rats the regular decrease of the thyroxinemia which occurs in the control Rats. So the vitamin A-deficient Rats studied in plateau of weight have a total thyroxinemia greater than that of control Rats (+71%). It is possible to speculate that numerous symptoms of the deficiency are the result of this hyperthyroxinemia.