Abstract A PREVIOUS report from this laboratory (Berg and Bearse, 1961), indicated that restricting feed intake of pullets to 83 percent of ad libitum consumption from 8–21 weeks of age did not retard sexual maturity or affect subsequent rate of lay when the pullets were subjected to constant nine hours of light per day during the same period. This was in contrast to the results of Sunde et al. (1954), Milby and Sherwood (1956), Tomhave (1958) and MacIntyre and Aitken (1959) who found that restricted feeding retarded sexual development. The results of these investigators were obtained with winter or spring hatched pullets which matured under increasing or long day length. A more detailed experiment has been conducted to determine the effect of photoperiod on the response of developing pullets to restricted feeding. Restricting feed intake by 20 percent has been studied under four different lighting procedures. EXPERIMENTAL PROCEDURE The test…