In terms of energy and fat content, several livers are slightly different, among which bovine liver and sheep liver have the highest energy. Among protein, protein content in pig liver and bovine liver is the highest, and protein content in duck liver is the least. Let's talk about vitamin A first. It is a very important vitamin in the liver, and the eyesight improving effect of the liver is attributed to it. Vitamin A can also promote growth and development, maintain skin health and enhance immunity. The content of beef liver and sheep liver is the highest, followed by chicken liver, duck liver and pig liver, and duck liver is the lowest.