Compound feed suitable for ternary commercial fattening pigs and preparation method of compound feed

The invention discloses a compound feed suitable for ternary commercial fattening pigs and a preparation method of the compound feed. The compound feed comprises a basic feed and a cottonseed meal fermented feed, wherein a mixture of cottonseed meal and bran is subjected to low-temperature fermentation, and the compound feed suitable for ternary commercial fattening pigs is finally prepared through optimization of a fermentation process. The protein content of the compound feed is higher than that of single fermented bran or cottonseed meal, and soybean meal can be replaced, so that the cost of the compound feed suitable for the ternary commercial fattening pigs is reduced, and besides, moisture can be improved to guarantee the conditioning effect. The feeding condition of the compound feed suitable for the ternary commercial fattening pigs, provided by the invention on the ternary commercial fattening pigs is further investigated, and when the mass ratio of a cottonseed meal fermentedfeed to a basic feed is