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. 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.