Dr Todd Applegate is Head of Department and R. Harold and Patsy Harrison Professor of Poultry Science at the University of Georgia, USA. He is a Fellow and former President of the Poultry Science Association (PSA). Amongst other honours, he is a recipient of the PSA’s Evonik Degussa Award for Achievement in Poultry Science. Professor Applegate has edited two previous books for Burleigh Dodds Science Publishing: Achieving sustainable production of poultry meat Volume 2: Breeding and nutrition and Achieving sustainable production of poultry meat Volume 3: Health and welfare, both published in 2017. Gonzalo González Mateos is Agricultural Engineer, PhD in Veterinary and in Animal Nutrition. Professor of Animal Production at Universidad Politécnica de Madrid (Spain). He has participated in a total of 170 research projects and published 150 research papers in international scientific journals. He has been involved in over 500 seminars, conferences, communications, and poster presentations at national and international congresses in more than 45 countries. Dr Samuel E. Aggrey is a Richard B. Russell Professor of Genetics, NutriGenomics and Bioinformatics at the University of Georgia, with an international reputation for his work on the genetics of feed utilization efficiency and genome selection in poultry. Dr Guillermo Tellez Isaias worked at the National Autonomous University of Mexico for 16 years and was previously Head of the Avian Medicine Department at the College of Veterinary Medicine. Currently, Dr Tellez is a Research Professor at the Center of Excellence in Poultry Science, University of Arkansas, USA where his research is focused on the advantages of the poultry gastrointestinal model to evaluate the beneficial effects of functional foods to enhance intestinal health and disease resistance. Dr Elisabeth Baéza is a member of the World Poultry Science Association and has contributed more than 130 peer-reviewed research publications to national and international journals. In addition, Dr Baéza has also written four book chapters and is an Associate Editor for several academic journals, including European Poultry Science. Dr Xin Gen Lei is Professor of Molecular Nutrition in the Department of Animal Science at Cornell University, USA. Professor Lei has an international reputation for his wide-ranging research in nutrition as well as algal biomass research. Amongst his many achievements, Professor Lei developed a new phytase enzyme that is now used in 46 countries to improve feed phosphorus bioavailability to animals and reduce their phosphorus excretion. He has won a number of awards from The American Society for Nutrition and the American Society of Animal Science. He is Associate Editor of the Journal of Nutrition as well as President of TEMA (Trace Elements in Man and Animals).