Most vets don't treat chickens unless they have a special interest in them. Here are a few articles to read about egg yolk peritonitis and internal laying:
http://www.chickenvet.co.uk/health-and-common-diseases/egg-laying-issues/index.aspx
http://scoopfromthecoop.nutrenaworld.com/tag/laying-issues/
The following are from the Merck Manual about various illnesses of the reproductive tract:
Salpingitis is an inflammation of the oviduct, which may contain liquid or caseous exudate. In young pullets, it is often due to
Mycoplasma gallisepticum,
Escherichia coli,
Salmonella spp, or
Pasteurella multocida (fowl cholera) infection and can result in reduced egg production. It is a frequent lesion in female broilers and ducks at processing. On gross examination, salpingitis may be difficult to differentiate from impacted oviduct in adults. As the oviduct becomes nonfunctional, the ovaries are usually atrophied. Unless associated with an infectious problem, this condition tends to be found sporadically during necropsy of cull hens.
Egg peritonitis is characterized by fibrin or albumen-like material with a cooked appearance among the abdominal viscera. It is a common cause of sporadic death in layers or breeder hens, but in some flocks may become the major cause of death before or after reaching peak production and give the appearance of a contagious disease. It is diagnosed at necropsy. Peritonitis follows reverse movement of albumen and
Escherichia coli bacteria from the oviduct into the abdomen. If the incidence is high, culture should be done to differentiate between
Pasteurella (fowl cholera) or
Salmonella infection. Antibiotic treatment of peritonitis caused by
E coli infections is usually ineffective. Management of body weight and uniformity, reproductive development (ovary follicle growth and maturation), and drinking water sanitation are the best preventive strategies.
Internal laying
In these hens, partially or fully formed eggs are found in the abdominal cavity. 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. No control or treatment is known. This condition is related to erratic ovulation and defective egg syndrome
Lash Eggs from salpingitis
