- Sudden change of grist presentation
- Too high energy level, due to a reduction in consumption time
- Faulty manufacture
– for instance, incorrect salt inclusion.
• Intensity of light too bright:
- Light source generally too powerful.
- Direct light from fluorescent bulbs (especially) or tubes; depending on the type.
- Entry of direct sunlight into the poultry house.
- Flickering bulbs
- Sudden increases in light duration
• Nests brightly illuminated – bird’s vents targeted during egg laying.