linearly reduced (P < 0.001) apparent total tract digestibility coefficient (CATTD) of gross energy (GE) by 0.04 and of CP by 0.08 feeding Phase 1 diets, quadratically reduced (P < 0.001) CATTD of GE by 0.01 and linearly reduced (P < 0.001) CATTD of CP by 0.06 feeding Phase 2 diet