EN
Up to 98-99% pollution of the environment with ammonia comes from agricultural sources. It is evaluated that about 22% nitrogen discharged to the environment come from pig production. The main reasons of such nitrogen excretion are high level of protein in diets and not properly balanced amino acid proportions. Decreasing of protein in pig diets leads often to worsening in productive results and slaughter quality of carcasses. However, the decrease of protein is possible when the basic amino acids like lysine, methionine, tryptophan, threonine, are well balanced. To achieve such effects the amino acids should be balanced on the basis of intestinal digestibility. It is suggested that the Polish feeding standards for pigs should recommend lower level of protein for fatteners and the amino acid contents ought to be balanced on the basis of their intestinal digestibility.