Abstract Fertile eggs were obtained from vitamin E-deficient hens mated with normal males (Card et al., 1930). Mortality due to hemorrhages was observed for vitamin E-deficient embryos by fifth day of incubation (Adamstone, 1931). Preliminary studies indicated a decreased fertility but no depression in egg production of Coturnix coturnix (Japanese quail) and the results of one of the experiments is reported here. The composition of the vitamin E-deficient diet used in this study is given in Table 1. On addition of 4 I.U. of vitamin E (tocopheryl acetate) per 100 gm. of the above diet, the vitamin E-supplemented control diet was obtained. The diets contained 27.5% crude protein, 1.5% Ca, and 0.9% total phosphorus. Two groups of 15 females and 4 males each were housed in community cages in a room at 21.11 ± 2°C. and 55% humidity and fed each of the above diets. Before starting birds on experimental diets, . . .