'''Achromatosis''' ''aka'' '''the failure to lay down normal feather pigments''', is important as it indicates a '''significant underlying nutritional deficiency''', however the level of pigmentation does not reflect the severity of the deficiency. Only in extreme cases do the feathers not | '''Achromatosis''' ''aka'' '''the failure to lay down normal feather pigments''', is important as it indicates a '''significant underlying nutritional deficiency''', however the level of pigmentation does not reflect the severity of the deficiency. Only in extreme cases do the feathers not |