Partial replacement of dried whey with dried hydrolysate of pig intestines resulted in a delayed positive growth performance response in three experiments. In weeks three and four, average daily gain and average daily feed intake were increased an average of 23.9 and 17.6%, respectively, by feeding intestinal hydrolysate in weeks one and two. The active component(s) in the product may speed the maturation of the pig’s ability to digest and/or assimilate nutrients.