Eggs can become rotten or explode due to the following reasons:
Eggs become infected with infectious diseases from the parent flock (Salmonella bacteria).
Wet and dirty bedding or laying nests leads to infections of the egg with bacteria (e.g. Pseudomonas, E.coli, etc.).
Eggs have been wet prior to setting.
Improper egg cleaning procedures
a) Cleaning eggs in water which has a lower temperature than that of eggs
b) Cleaning eggs with a disinfection solution that has been prepared incorrectly not following the manufacturer recommendations.
High air humidity during egg storage.
Contamination during storage. Activities like sweeping or spraying water on the floor of the egg storage area can deposit large amounts of bacteria on the eggs.
Failure to clean incubators following an egg explosion leaves bacteria in the chamber that can contaminate other eggs.
