The liver of geese obtained after artificial feeding and forced fattening is called foie gras. Fatty goose liver is 4 to 6 times heavier than ordinary goose liver. Generally, varieties with large body size, fast growth and easy fattening are used to produce fatty liver.

Goose liver is a precious delicacy favored in the international market. It not only has a unique flavor, but is also rich in nutrients. Fatty foie gras contains 6.9% to 12.7% protein, 37.8% to 56.5% fat, and 35.7% to 47.4% moisture; while normal foie gras contains 22.3% to 23.9% protein, 0.4% to 6.6% fat, and 66.9% to 68.4% moisture. . The fat in fatty liver mainly exists in the form of unsaturated fatty acids, which contain fatty acids necessary for human metabolism and physiological activities. Therefore, it is a good health food and is very popular in the international market.