In the first of two presentations on corn particle size, Ph. D. candidate Oscar Rojas discusses the advantages and challenges of reducing the particle size of feed ingredients, and presents the results of two experiments designed to measure the effect of reducing the particle size of corn on energy, phosphorus, and amino acid digestibility  in growing pigs. Adapted from a presentation at the 2013 ASDA-ASAS Joint Annual Meeting, Indianapolis, IN, July 8-12.