The standards for amino acids, protein and macro minerals for weaned pigs are shown in table 1. The amino acid standards do not include a safety margin as they are determined as the economic optimum level in diets containing conventional ingredients under normal price relations. Consequently, it is possible to improve productivity slightly by increasing amino acids and protein, but this will not be profitable as the increase in price exceeds productivity improvements. Furthermore, a protein increase will increase the risk of diarrhoea outbreaks.