The etiology and pathogenesis of fatty liver syndrome are still unclear, and it is generally believed to be related to the following factors:

(1) Due to genetic factors, some strains of chicken are susceptible to this disease.

(2) Chickens have physiological sensitivity to fatty liver syndrome after laying eggs, and this sensitivity is stronger with the extension of laying period.

(3) Modern chicken production mode makes chicken lack of activity space and become a "machine" for feeding and production. Poor living environment and vigorous metabolism are the inducement of fatty liver.

(4) There are toxins in the feed, and the feed quality is poor.

(5) A high-energy and low-protein diet.