This book explores the innovative use of ligno-cellulose, a plant-based material, as both livestock feed and a renewable source of bioenergy. Drawing on research from the 1970s and recent breakthroughs in enzyme technology and genetically modified organisms (GMOs), it reveals how agricultural byproducts-like food waste-can be transformed into cost-effective, sustainable solutions for animal feed and biofuel production. It also examines cutting-edge methods for making plant fibers more digestible and harnessing microbes to improve digestion. With a focus on biotechnology and sustainability, this book offers practical insights for transforming farming practices, improving food production, and advancing clean energy. A must-read for anyone passionate about biotechnology, agriculture, and environmental science.