In internal laying, partially or fully formed eggs are found in the abdominal cavity (see ). Such eggs reach the cavity by reverse peristalsis of the oviduct. If they have no shell, they are often misshapen because of partial or complete absorption of the contents. Frequently, only empty shell membranes are present.
This condition is related to erratic ovulation and defective egg syndrome Defective or Abnormal Eggs in Poultry Most “ridged,” “sunburst,” “slab-sided,” soft-shelled, or double-shelled eggs are the result of eggs colliding in the shell gland region of the oviduct when an ovum (yolk) is released too soon... read more . Internal ovulations can happen throughout the life of the hen. Some hens are chronic internal layers.
No control or treatment is known.