Weaning, in ruminants and pigs, is a critical period in the life of young animals as it involves the transition from a milk-based diet to a solid feed diet. Similarly, in poultry, feeding in the first weeks is the key for hatched chicks to reach advanced life stages in a healthy way. According to experts, this transition process affects not only nutritional intake, but also digestive physiology, intestinal microbiota, immune system and future performance of the animals. For this...