Corn gluten meal is rich in amino acids and natural pigment - lutein. It is an important feed ingredient and is widely used especially in chicken feed. Because of this, the market has been flooding with a variety of inferior corn protein flours, and most feed mills have limited testing conditions and cannot detect lutein and amino acids batch-by-batch. Usually, only indicators such as appearance, moisture, and crude protein are used to determine quality. This has made these fake and shoddy products all the more ridiculous. The phenomenon of counterfeiting and counterfeiting has become increasingly serious and has directly affected the quality of feed. Based on years of testing experience and market research, the author summarizes some simple and easy-to-use falsification methods for your reference.