583relationship was evident between differences in proximate composition and metabolizable energy content in the case of the soybean oil meals. The metabolizable energy content of soybean millfeed increased as the fat and protein content of this material increased and its crude fiber content decreased. ACKNOWLEDGMENTSThese studies were supported in part by a grant-in-aid from The National Soybean Processors Association, Inc., Chicago, Illinois. Most of the samples studied were obtained through the cooperation of the Soybean Research Council of that organization. Other sam-