Composition and method for processing prolamin-containing feed source into a low-vitreous gelatinous feedstuff. The feedstuff is fed to ruminant animals for the purpose of potentiating either milk production and/or conception. The feed source can be corn and the ruminant animal can be a bovine, and might be a cow. The method includes processing, by extrusion, a prolamin-containing feed source having a starch-protein matrix within which the included protein is composed of at least 3% percent prolamin. This processing produces a hydrophilic gelatinous feedstuff that has starch and protein content. The hydrophilic low-vitreous gelatinous feedstuff is fed to a ruminant animal. A rumen-retained portion of the fed feedstuff is retained within the rumen of the animal for at least a twenty-four hour period, and during the first twenty-four hours of that period, at least seventy-five percent of the starch content of the rumen-retained portion of the fed feedstuff is digested.