Abstract THE use of grass silage in the poultry diet has been under investigation at the Kansas Agricultural Experiment Station since the spring of 1934. Different methods have been used for preserving young oat grass cut when or before the first joints appeared. While the silage made at this early growth stage and by the method used has not been of the highest quality, the carotinoid pigments and protein remained fairly high and the birds ate it readily. Such silage when fed at the rate of four pounds a day per 100 hens usually gave a rich golden color to the egg yolk. It was observed, however, that a number of the hens after 8 or 10 days produced eggs with an olive colored yolk, commonly referred to on the market as “grass eggs.” While grass eggs appear to be high in nutritive value as judged by the chemical analysis and . . .