• To promote birds perching as high as possible during night, this avoids crowding in front of the nest box in the morning.
• High perching can be promoted by using a longer dimming period.
• A light intensity in the system close to the light intensity in the rest of the house helps to create a space in the system not comfortable to lay eggs.
• Avoid lights in the system that also light the nest box.
• It is essential to promote birds use of perches and plateau’s to move up and down in the system or in between systems.
• Vertical movement can be stimulated by limiting access to water or feed on certain levels. When this is practised it is at the utmost importance to check if birds living on these levels eat and drink sufficiently.