STUDIES on the effect of different dietary energy, protein and fat levels in the nutrition of laying hens, particularly caged layers, have been limited.Heuser and co-workers (1945) were among the first to show that rations low in fiber supported a higher rate of egg production compared to similar rations of high fiber content. Bird and Whitson (1946) have shown that the productive efficiency of laying rations was related inversely to fiber content. Following the work of Scott et al. (1947) it was demonstrated that high energy rations tended to promote more rapid growth and better feed conversion in broilers. Quisenberry (1950) reported an increase in egg production and body weight with less feed consumed by birds on a low fiber-high productive energy ration and confined to laying cages. Singsen et al. (1952) and Gerry (1954) reported higher egg production efficiency, measured as feed requirement per dozen eggs, with rations …