Valaja, Jarmo, and Hilkka Siljander-Rasi. “Effect of Dietary Crude Protein and Energy Content on Nitrogen Utilisation, Water Intake and Urinary Output in Growing Pigs”. Agricultural and Food Science 7, no. 3 (January 1, 1998): 381–390. Accessed June 29, 2024. https://journal.fi/afs/article/view/72869.