A hen will sometimes become a ‘blind’ or ‘internal’ layer which can lead to Egg Yolk Peritonitis (EYP).
The yolk is produced but misses the infundibulum and becomes a free-floating yolk in the abdominal cavity. This yolk has no way of leaving the abdomen and a hen will develop a typical penguin-like stance becoming very upright with a large swollen hard belly. The hen will often have a vibrant red comb (Figure 1) denoting she is in lay.
