Soy protein powder: Specifications: Protein ≥ 55% Moisture ≤ 7% fat ≤ 1% ash ≤ 4% of total fibers ≤ 4% color light yellow or milky white particle size of 100 mesh -150 mesh Total plate count ≤ 30,000 / g PH value 6.3-6.8 E. coli may not be detected Advantages: 1, Compared with fish meal: fish meal is restricted supply of impurity content and the quality of instability, pig food absorption rate is low, easy to diarrhea; short shelf life of fish meal is not easy to save. 2, compared to plasma proteins: Although plasma protein feed industry recognized high-quality protein source, it is undeniable that the price is expensive, while plasma proteins of animal origin. 3, compared with skim milk: skim milk protein content, amino acid content is low, the high price and limited supply of goods. 4, compared with the whey powder: whey powder protein content is low, and timely supply and high prices, slow growth in the pig food.