A conceptual lignocellulosic 'feed+fuel' biorefinery and its application to the linked biofuel and cattle raising industries in Brazil

► A proposed sugarcane 'feed+fuel' biorefinery producing bioethanol and yeast. ► Yeast used as a high-protein animal feed supplement. ► In cattle grazing, yeast substitutes for grass to release land for biomass production. ► In Brazil our model demonstrates ethanol production raised threefold.