The CTTAD of dry matter (DM), nitrogen (N), gross energy (GE), calcium (Ca) and phosphorus (P) was determined using chromic oxide (0.2%) as an inert indicator. Pigs were fed diets mixed with chromic oxide from d 18 to d 24. Fresh fecal grab samples were collected via massaging the rectum from two pigs (one barrow and one gilt) randomly selected from each pen from d 22 to 24 and were mixed and pooled, and a representative sample was stored in a freezer at −20 °C until analyzed. All feed and fecal samples were analyzed for DM, N, energy, Ca and P following the procedures outlined by the AOAC (2000) and then the CTTAD were calculated.