Wide access channels and high market price. The raw materials of animal oil are cheap, and the access channels are wide. In addition, two products, animal oil and oil cake, can be obtained after boiling, and the products are widely sold and the market price is high, so the profit rate of refining animal oil is high. Animal oil, that is, animal fat, is animal fat. Animal oil for human consumption generally comes from pigs, cattle, fish, etc., and can be used to process food, so that food has the fresh flavor of meat.