¹Aydın Adnan Menderes University, Faculty of Veterinary Medicine, Department of Animal Science, TR-09100 Aydın - TÜRKİYE DOI : 10.9775/kvfd.2023.29874 This study was conducted to evaluate the effect of LED light color and stocking density on the growth performance, carcass, and breast meat quality characteristics of quails. The experiment comprised 720 1-day-old mixed-sex Japanese quails (Coturnix coturnix japonica) randomly divided into 6 experimental groups with 4 replicates in each group. Experimental treatments included three different LED light colors (white, monochromatic blue, and monochromatic green) and two different stocking densities (100 and 200 cm2/bird) in a 3x2 factorial design. The feed intake and body weight of quails were measured weekly. At 42 days of age, 20 quails per treatment group were randomly selected for carcass and breast meat quality characteristics analysis. Body weight gain was significantly higher in the blue and green LED light treatments (P<0.05). Quails reared at 200 cm2/bird significantly determined the highest body weight gain (P<0.001). Quails reared at 200 cm2/bird had the best ratio of feed conversion ratio (P<0.01). Breast meat yield and weight were higher in quails reared at blue LED light. Blue LED light tended to increase the water-holding capacity of breast meat (P<0.01). The breast meat L* value decreased significantly as stocking density (200 cm2/bird) increased (P<0.05). However, despite the difference in pH15, pHu, and L* value of breast meat, other meat quality characteristics were not different among the stocking density groups. In conclusion, it is shown that mono-crop monochromatic blue or green LED light and 200 cm2/bird floor space have a utilization effect on quail performance traits. Keywords : LED light color, Meat quality, Performance, Quail, Stocking density