A bump on the egg’s head might indicate a serious problem.
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 about Newcastle disease here or in the book Egg Signals, by Piet Simons.
Also interesting: When hens can't stand properly
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.