Higher bioavailability of chelated elements compared to inorganic forms leads to better absorption due to variety of absorption pathways in digestive tract and less interactions with nutrients in lumen. To that end, a 42-d study with total of 1248 day-old As-hatched Arbor acres chickens (allocated into 8 dietary treatments with 6 replicates of 26 birds) was conducted to examine performance, histology, relative organ weight and plasma biochemical parameters in broiler chickens fed different levels of Mn, Zn, Se, Fe, and Cu from organic and inorganic sources. Experimental groups were as followed: 1- Basal diet supplying 50% of requirements with inorganic trace elements, 2- Basal diet supplying 75% of requirements with inorganic trace elements, 3- Basal diet supplying 100% of requirements with inorganic trace elements, 4- Basal diet supplying 125% of requirements with inorganic trace elements, 5- Basal diet supplying 33% of requirements with Bonza organic trace elements, 6- Basal diet supplying 66% of requirements with Bonza organic trace elements, 7- Basal diet supplying 100% of requirements with Bonza organic trace elements, 8- Basal diet supplying 100% of requirements with an amino acid-organic trace elements. Our results showed that the experimental group fed with Bonza organic elements at 66% of birds requirements had the highest final body weight gain, average daily intake and lower FCR (feed conversion ratio) ( P 0.05). Birds fed Bonza organic elements at 66% of requirements had higher relative spleen and bursa of Fabricius weights compared to birds consumed inorganic elements. However there was no significant difference among the experimental groups for relative thymus, pancreas, and liver weight (as percentage of live body weight). Results indicated that the group supplied with Bonza organic elements at 66% of requirements had the highest ( P 0.05) villous length to crypt depth ratio compared to groups receiving Bonza organic elements at 33% of requirements and groups receiving inorganic elements at 50% and 100% of requirements. There was no significant difference ( P 0.05) among experimental groups for level of serum Albumin. The plasma uric acid was affected by the experimental groups ( P 0.05). The plasma uric acid level of birds that received inorganic elements at 50% of requirements was higher compared to groups that received inorganic elements at 75% and 120% of requirements. The ash content and the color characteristics (L*, a*, b*) values of tibia bone were not affected by the experimental groups. Our results indicated that, it is possible to achieve to the same performance by using lower levels of organic trace elements. Due to their increased bioavailability, organic trace elements have demonstrated opportunities for improved physiological-metabolic functions, reduced environmental emissions and feed costs. Keywords: Broiler chicken, Chelated elements, Bone strength, Blood parameters, Color analysis, Intestinal morphology