Abstract VARIATIONS in egg yolk color are of economic importance to the commercial poultryman. Because of rigid egg grading and candling practices, there is a demand for eggs with uniform-colored yolks for discriminating markets. This, together with the occasional necessity for the poultryman to vary his laying ration, makes it desirable that he know the effect of the various in gradients of his laying ration on the yolk color of the eggs produced. It was the purpose of this investigation to study these relationship. REVIEW OF LITERATURE From time to time, during the past three decades some investigational work pertaining to the problem of egg yolk color has been reported Dryden (1905) reported the production of highly colored egg yolks by feeding green alfalfa. Before this, it had been frequently observed that yellow corn produced a rich, golden yellow, egg yolk. Palmer and Kempster (1919) fed various rations to individual hens . . .