The effect of monochromatic light-emitting diode light on reproductive traits of laying hens

Abstract

Artificial illumination is an important exogenous factor in the control of many physiological and behavioral processes in the management of layers. The objective of this study was to examine the effect of monochromatic light on reproductive traits, fertility, and quality of eggs of local mountainous laying hens of China. Five hundred fifty-two19-wk-old hens were randomly divided into 4 groups, with each group consisting of 138 birds. Feed and water were provided ad libitum. Light treatments were control white (mini-incandescent light bulbs), blue (480 nm), green (560 nm), and red (660 nm). Birds maintained under green light produced fewer eggs than other groups. The red light group had a greater egg shape index than other groups and had greater fertility and hatchability than other groups. Egg weight was affected by light wavelength, but the rate of egg production was not. The ratio between egg components can be changed by the light source without changing the egg weight. Egg quality was the best for hens exposed to the green light.