I should like to know a clear definition of "fatty liver hemorrhagic syndrome". It is not well-described by current literature.

Dear Ierardi Enzo

Fatty liver (Steatonecrosis) is a condtion of  microvesicular fat accumulation in the hepatocytes.

@Neeraj, I should like to clarify my question: my doubt regarded the word "haemorragic" since stetonecrosis is not accompanied by bleeding at the best of my knowledge.

Dear Ierardi Enzo'

Please find description, this disease occured by stetonecrosis only but limted to hens (females) only. Please find below exact happening on FLHS.

Fatty liver hemorrhagic syndrome (also referred to as fatty liver syndrome), a disease in chickens and other birds, affects only hens (females).[1] Birds with this disease have large amounts of fat deposited in their liver and abdomen.[2] This often results in an enlarged liver that is easily damaged and prone to bleeding.[3] In some cases the disease is fatal, usually as a result of blood loss from an internal hemorrhage in the liver.[1] The hemorrhage often occurs when a hen is straining to lay her egg.[3] Fatty liver hemorrhagic syndrome is "the major cause of mortality in laying hens.

@Neeray, no problem, your good point out let us know that the clinical evolution of the disease is different in humans from that in chickens and other birds. Thank you for your interesting clarification. I wish you find an appropriate dietetic/herbal therapeutic approach.

Have a look at Silybum marianum (St Mary's thistle; Milk thistle).  It is one of the best hepatoprotective and hepatoresorative herbs.  There is some evidence to show that it can enhance the synthesis of ribosomal RNA and proteins, and thereby cellular regeneration (Sonnenbichler et al, 1999).  There is an excellent and up-to-date review of it in Principle and Practice of Phytotherapy 2nd edition, 2013, by Bone and Mills. Pulbisher: Elsevier

@Diana, excellent idea. The substance is marketed in Italy withe name of Silliver or Legalon for the care of liver steatosis. However, lipid and glucid methabolisms (i.  e. hypercholesterolemia or insulin resistance) are relevant factors in humans. @Neeray, is there somthing of similar in the metabolism of birds?

Picrosides are helpful in hepatoprotective so Neopicrorhiza scrophulariflora or Picrorhiza kurroa might work. 

take a look at LiberHerbarum.com, there might be a reference