On 26,000 Ross 508 broiler chickens (two groups of 13,000 per pen) the effect of dietary substitution with in organic trace minerals or organometallic chelates on performances and bones tructure c trace minerals or organometallic chelates on performances and bone structure was studied. Treatments consisted of a commercial diet integrated with 0.5% of a vitamin-mineral premix containing inorganic trace minerals (CTR) or organometallic chelates (MHA) using Methionine Hydroxy Analog. Production performance was measured during the 52 d trial period and bone structure was evalu- ated at the slaughter (52 d). Significant (P=0.038) higher values were observed in the finishing period (41 to 52 d) for the body weight of the treated group (3560 g vs. 3358 g). The same trend was observed for the ADG (MHA 87.6 g/d vs. CTR 71 g/d; P<0.05). Concerning ash percentage significant higher values were observed in the CTR group for femur (49.01% vs. 51.45%; P<0.01) and tibia (53.87% vs. 49.79%; P<0.001); femur showed also higher values for bone radiopacity (MHA 0.21 px vs. CTR 0.26 px; P=0.035). MHA group showed significant higher value for morphometric measures of the femur and tibia. Results suggest that organometallic chelates can be included in the diet without compromising broiler performance.