Effect of various LED light color on the behavior and stress response of laying hens

The effects of various light emitting diode colors were observed on laying hen behavior A total of 200 Hy-line brown laying hens were employed, and lighting was performed as follows; white (W, control; 16 h/d), red (R; 618-635 nm; 16 h/d), green (G; 515-535 nm; 16 h/d), blue (B; 455-470 nm; 16 h/d), red?green (R?G; 14 h→2 h/d), red?blue (R→B; 14 h→2 h/d), red?green?blue (R?G?B; 12 h→2 h→2 h/d) and red?blue?green (R→B?G; 12 h→2 h→2 h/d) light Behaviors were recorded as frequencies except perching behavior, which was expressed as time per hour Hens reared in R light were more active, as expressed by greater feather pecking, ground pecking, ground scratching, and tail wagging activity than those of hens in the B light treatment Birds spent more time perching under the B light Feather pecking and ground scratching behaviors decreased, and preening behavior increased in frequency with age of the laying hens On the other hand, numerically higher H: L ratio and tonic immobility duration were obtained under the R→B treatment These results may be useful to control the behavior of laying hens.