The Reduction of Crude Protein with the Supplementation of Amino Acids in the Diet Reduces the Environmental Impact of Growing Pigs Production Evaluated through Life Cycle Assessment

Two experiments were performed to determine the digestibility of diets with crude protein (CP) reduction supplemented amino acids (18.15; 17.15; 16.15 and 15.15%) growing pigs (30–50 kg), assess use nutrients account for manure excretion, evaluate performance, backfat thickness, Longissimus lumborum depth, plasma urea, aiming environmental impact through life cycle assessment (LCA); first time in Brazil interacting developed CP LCA. The resulted greater daily weight gain (p = 0.011), final 0.020), better N P, P retained 0.003 p 0.017, respectively). There was a linear acidification potential 0.015), eutrophication 0.001), land occupation 0.005) when dietary decreased from 18.15 15.15%. supplementation kg) improved gain. Through LCA, performance metabolism data, it concluded that acidification, categories, impacts reduced as concentration reduced.