This is the reason most hens are in the upper laying nests.
The image below was provided by Roodbont Publishers and is part of the Look, Think, Act series that will be published weekly on World Poultry. Hover over the icons within the image for more information. Read more in the book Egg Signals, by Piet Simons.
Also interesting: The cause of soft shells
These issues have to do with the birds’ health. Visit World Poultry’s health tool to learn everything you need to know about poultry health.