KREULA, M.; ETTALA, T. On the amino acids in the urine of dairy cows fed urea as the sole or partial source of nitrogen . Agricultural and Food Science, [S. l.], v. 49, n. 4, p. 258–263, 1977. DOI: 10.23986/afsci.71942. Disponível em: https://journal.fi/afs/article/view/71942. Acesso em: 17 may. 2024.