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The mess left behind by broken eggs is an obvious reason for you to care about the shell quality of the eggs laid by your hens. A less visible reason is the higher level of salmonella found in cracked compared to intact eggs – especially if they are improperly washed.
The most common causes of weak shells eggs in your flock are:
Less common problems include insufficient manganese in the feed, toxins or pesticides, and miscellaneous diseases such as coccidiosis and Infectious Laryngotracheitis (ILT).
Shell quality can be improved by providing the nutrients needed for the hen to build her bone reserves of calcium and make good shells:
These practices will not stop the natural weakening of the shells as your hens age but will help to prevent any premature problems. If your old hens go into a moult, shell thickness will be temporarily improved.
Weak Shells can lead to cracks & "Leakers"/ Photo- University of Georgia Cooperative Extension Service