The feed intake response and growth performance of chickens reared under such light colours may not always be as good as with the white light. Better results could, however, be obtained when interacting colours of light with other factors such as light intensity and feed colour. In some studies, feed intake and growth performance were improved under blue or green lights provided at high- rather than low intensity. In other studies, improvement was also obtained with red-dyed feed given under blue light, but no other combinations of light and feed colours have yet been examined.