The increasing human population, growing income and urbanization worldwide creates a rapidly growing demand for livestock products. Not only quantity matters, sustainable production is getting increasingly important. To maximize efficiency and minimize the environmental footprint of livestock products, one needs to deeply understand animal biology. Knowledge in animal sciences, particularly in farm animal nutrition, is vital to meet those demands, and that is where this book can help. This book focusses on combining basic and applied research and its implications on energy and protein nutrition and metabolism. Relevant topics are presented and discussed in detail. The most important issues are: sustainable use of energy and protein in animal nutrition, new feeds, dietary additives, feed processing methods, mitochondrial and amino acids kinetics. Effects of heat stress, sanitary challenges, and feeding behaviour on energy metabolism, and methods and modelling approaches applied to animal nutrition are also part of the book. This makes ‘Energy and protein metabolism and nutrition’ an excellent source of knowledge for those who would like take animal nutrition into the future.