This experiment was conduced to determine the effects of different physical feed restriction levels on performance and carcass quality during finisher periods from 36 to 45 day old. Hence Completely Randomized Design(CRD) that included different levels of physical feed restriction ( in levels 10,20,30 or 40% less than adlibitum feed intake in control birds) and one control group (ad libitum feed intake) were used in 5 treatments with four replicate each containing five male broiler chicken (total 100 birds) of Arian strain in cage system. The results showed that feed intake in different levels is less than control birds(p<0.01). Live weight (at 45 day old) , body weight gain, crude fat, crude protein, ash and dry matter percentage of carcass at all levels except 10 % level were lower than control birds(p<0.01), and abdominal fat percentage at whole levels had significant difference with control birds(p<0.01). Also thigh percent in 40 % levels and carcass weight in 20,30 and 40% were lower than control birds(p<0.01). The results of this study suggest that using of feed restriction in 10 % less than ad libitum feed intake has any adverse effect on broiler chickens performance and carcass traits.
