Diego Navarro, a Ph. D. candidate in the Stein Monogastric Nutrition Laboratory, presents the results of a study he conducted to determine the relationship between physicochemical characteristics of eight feed ingredients and the total tract digestibility of dry matter, energy, fiber, and protein. The characteristics studied include bulk density, solubility, water holding and water binding capacity, swelling, viscosity, cation-binding capacity, and fermentability. Adapted from a presentation at the 2017 ASAS Midwestern Section meeting, Omaha, NE, March 13-15.