Choline is an essential nutrient for health,growth and development of poultry and it plays important roles in the synthesis of the membrane phospholipids,methyl-group metabolism,neurotransmission,and liver lipid transport. Dietary choline deficiency in poultry causes a significant decrease on growth and development rate and feed intake. This review provided the clinical characteristics of choline deficiency in poultry,the main factors affecting choline deficiency,and the effects of choline deficiency on hea...