The general goal is to improve production efficiency and product quality, reduce nutrient excretion, and improve production margins for agriculturally important livestock via advancing our understanding of nutrient requirements and use. The focus is on developing a more precise understanding of nutrient requirements of animals and deriving more precise equations to predict the nutrient requirements of animals. Research is also focused on determining the nutritive value of new feedstuffs, such as those generated as byproducts of bioenergy production. The conducted research relies on basic research to understand biological mechanisms that is then followed by applied research to develop technologies that can be applied to animal production scenarios.