The transition in piglets from suckling to eating solid feed is associated with a critical period of underfeeding, suboptimal growth rate and increased risk of diarrhea. The objective of the current study was to investigate if the piglets may show a preference for the intake of diets containing a specific protein concentrate ingredient. To test this hypothesis, we compared a hydrolysate of animal protein (APH) (Palbio™), and a hydrolysate of soy protein, or spray dried porcine plasma (SDPP). 96 piglets were weaned at 21 days of age and randomly subdivided into 3 groups of 32 pigs each. Piglets were distributed into 24 pens (8 replicates of pigs per group).