Method for preparing organic feed for pigs, cattle and sheep by fermenting biological straws in grain saving mode

The invention discloses a method for preparing an organic feed for pigs, cattle and sheep by fermenting biological straws in a grain saving mode. The organic feed includes the following components byweight: 50-80 parts of soybean straw, 10-20 parts of sorghum, and 8-18 parts of soybean meal, 4-12 leaves of elm leaf, 7-17 parts of potato peel, 8-20 parts of corn leaf, 5-15 parts of sweet potato seedling, 4-12 parts of spirulina powder, 1-3 parts of bacillus subtilis, 1-2 parts of lactobacilli, 8-14 parts of caulis spatholobi, 1-2 parts of hydrolyzed active amino acid and 1-2 parts of microbialconcentrated enzyme protein. The method is simple. The prepared organic feed has rich varieties of raw materials, is nutritious, free of chemical substances and fragrant after fermentation. If the organic feed is used for feeding domestic animals such as the pigs, the cattle and the sheep for a long term, the body resistance of the pigs, the cattle and the sheep can be effectively improved to promote growth, and the origi