In general, a level around 30% soybean meal is more than sufficient to cover most amino acid requirements in most practical feeds. Of course, this oversimplification ignores the long-term problem of excess nitrogen excreted in the environment and several other issuesIn general, a level around 30% soybean meal is more than sufficient to cover most amino acid requirements in most practical feeds. Of course, this oversimplification ignores the long-term problem of excess nitrogen excreted in the environment and several other issues