Francois Blachier1, Guoyao Wu2. 1. Research Director at the National Institute for Agriculture, Alimentation and Environment, Nutrition Physiology and Ingestive Behavior Unit, Université Paris-Saclay/AgroParistech/INRAE, Paris, France. francois.blachier@agroparistech.fr. 2. Department of Animal Science, University Distinguished Professor, Texas A and M University, College Station, TX, USA.