The document discusses folic acid deficiency in chickens. It notes that folic acid is an essential vitamin for chickens of all ages, and is also known as folate, vitamin B9, and folacin. The document lists sources of folic acid including various vegetables, and outlines the effects of deficiency such as reduced growth, decreased egg production, and anemia. It also describes symptoms of deficiency like poor feathering and lists ways to diagnose, treat, and prevent folic acid deficiency in chickens.