大豆蛋白含量在36-42%之间，并不是绝对的是多少多少。
饲料中各种营养物质的含量，是在饲料样本风干样或绝干样的基础上测得，要不不同的饲料原料没有可比性。也即黄豆是干的，不是经过浸泡的。
All the protein content in soybean is against the dry weight. What you said 40 grams protein in 100 grams of dry soybean is true.
Regarding the wet, you have to figure it out how much dry soybean you soaked. The absolute protein will not change after wet.
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