Two commercial types of maize; largely used in the State of S. Paulo, Brazil, were tried as source of pró-vitamin A in growing pullets. The amount of pró-vitamin A was found to be practically doubled in "Cateto", a flint type with deep orange grains when compared with "Armour", a dent type with yellow oiange grains. Both "Cateto" and "Armour" proved to be equally good in preventing avitaminosis A, when used in the same proportion in the ration (70%). White corn used for comparison produced strong avitaminosis A.