Premix in feed formula generally refers to the mixture of minerals, trace elements, amino acids, vitamins, drugs and some functional and non-functional additives formed by scientific formula. It mainly provides minerals, trace elements, vitamins and amino acids. Necessary for animal growth; On this basis, protein (soybean meal, fish meal, cotton meal, etc. ), add some minerals (such as calcium and phosphorus) and some energy oil to become concentrate, which is also commonly known as concentrate; Add energy feed (corn, wheat bran, rice bran, etc. ) on the basis of concentrated feed, it becomes full-price feed, and if granulated, it becomes full-price pellet feed. Understand?