The coefficients of total tract apparent digestibility (CTTAD) of diets with four different protein sources were determined in growing pigs. The four diets were based on cassava root meal as energy source. Control diet (FM) included marine fish meal as the main protein source, diet BM included broken meat catfish by-product meal, diet OE included oil extracted catfish by-product meal and diet BH included bone and head catfish by-product meal. The four diets were fed to four growing pigs in a 4x4 Latin Square design. There were differences among the diets in the CTTAD of dry matter (DM), crude protein (CP), ether extract (EE) and ash, with the highest CTTAD of DM and CP in BM (87.8 % and 87.9 %, respectively) and the lowest in BH (77.5 % and 75.9 %, respectively) (P<0.05). Apparent digestibility of organic matter was highest in diet BH (91.3 %) (P<0.05), and lowest in diet FM (86.6 %) and diet OE (86.7 %). There was a significant negative relationship between apparent digestibility of CP and ash content in the diet (R2=0.95; P<0.05). It can be concluded that the total tract apparent digestibility of dry matter, crude protein and ether extract was highest in the diet with broken meat by-product meal and lowest in the diet with bone and head by-product meal.