METABOLIZABLE ENERGY 625

determinations with growing chicks. J. Nutrition, 64: 587-604. Hill, F. W., and R. Renner, 1960a. The metaboliza-ble energy of soybean oil meals, soybean millfeeds INCREASING production costs and narrowing profit margins encourage attempts to formulate least-cost diets. The abundant supply and lower price have made milo preferable to corn as a source of grain for poultry diets in the Southwest. The productive energy value of milo was given by Fraps (1946) to be 1,144 Calories per pound as compared with 1,145 for corn. Since Fraps ' original values were assigned they have been vari-ably modified by later workers and today values commonly used are 1,105 for corn and 1,100 for milo, Feed Bag Red Book (1962). A common practice in the Southwest has been to substitute milo for corn pound for pound but reducing the amount of protein concentrate to allow for the higher protein level (11%) of the milo, corn 8.6%. Recent introduction of hybrid milos and changes in fertilization and cultural practices have resulted in lower protein A contribution from the Texas Agricultural Ex-periment Station