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Abstract This study evaluated the effects of broiler age (A) and levels of replacement (L) of control diet (CD) on the utilization of energy and nutrients of whole corn germ. 720 one-day-old broilers (b) were allocated at completely randomized design to six treatments and six replicates, in three assays: pre-starter (1-8 days, 10 b/cage), starter (15-22 days, 6 b/cage), and grower (28-35 days, 4 b/cage) phases. The treatments were: CD and four test diets (L): 100, 150, 200, 250, or 300 g kg-1 of the CD replaced by WCG levels. The data were adjusted to the response surface model. The stationary points for apparent energy metabolizable (AME) and AME corrected for nitrogen balance (AMEn) were: 4173 and 3591 kcal kg-1, respectively, and coefficients of gross energy (AMCGE), crude protein (AMCCP), dry matter (AMCDM), and ether extract (AMCEE) were: 49.3, 40.4, 72.6, and 61.3%, respectively; and Ileal digestibility coefficient of crude protein (IDCCP), dry matter (IDCDM), digestibility crude protein values (DCP), and digestibility dry matter value (DDM) were: 78.0, 57.96, 8.50, and 56.17%, respectively. The EP for AMEn was at 18 days of age, 28 g kg-1 WCG. There was a correlation between A and L on digestibility and metabolisability of nutrient’s WCG. (A (L (CD germ 72 onedayold one day old b (b replicates assays prestarter pre 1 8 (1- b/cage, bcage b/cage , cage 1522 15 22 (15-2 2835 35 (28-3 phases 100 150 200 250 30 kg1 kg kg- model (AME (AMEn 417 359 kg1, 1, respectively AMCGE, AMCGE (AMCGE) AMCCP, AMCCP (AMCCP) AMCDM, AMCDM (AMCDM) AMCEE (AMCEE 493 49 3 49.3 404 40 40.4 726 72.6 613 61 61.3% IDCCP, IDCCP (IDCCP) IDCDM, IDCDM (IDCDM) DCP, DCP (DCP) DDM (DDM 780 78 0 78.0 5796 57 96 57.96 850 50 8.50 5617 56 17 56.17% 2 nutrient s 7 (1 152 (15- 283 (28- 20 25 41 (AMCGE (AMCCP (AMCDM 49. 40. 72. 61.3 (IDCCP (IDCDM (DCP 78. 579 5 9 57.9 85 8.5 561 56.17 ( (15 (28 61. 57. 8. 56.1 (2 56.