Vanessa Lagos, a Ph. D. candidate from the Stein Monogastric Nutrition lab, presents the results of an experiment designed to test the hypothesis that formulating diets based on a ratio between STTD calcium and STTD phosphorus instead of total calcium and STTD phosphorus will not affect calcium retention but will increase the efficiency of phosphorus utilization. Adapted from a presentation at the 2020 ASAS Midwestern Section meeting, Omaha, NE, March 2-4.