1. Three preparations were made for this experiment. Preparation I was made by mixing and drying the wet-raw insoluble of a molasses-butanol ol distiller's stillage with an equal amount of soybean oil meal (SOM), and preparation II was similary made from SOM and stillage by mixing in the ratio of 7 to 3. Preparation III was a simple dried inosoluble of stillage. 2. The effects of these preparations on the digestibility coefficient, growth value, visceral distribution and bone strength were studied. ....