Primary aspects of this plant-animal interface research program includes simultaneous quantifying of forage persistence and sustainability with animal responses to stocking strategies and grazing intensities. Component research areas include forage germplasm evaluations for team-released varieties; assessment of soil nutrient status under long-term nutrient cycling with fertilizer-stocking regimens; cow-calf and stocker performance on bermudagrass, small grains, ryegrass, and clover; and lifetime animal performance attributes from birth-to-pasture-to-feedlot-carcass with database archival on BeefSys.