ETTALA, T.; KREULA, M. Urinary nitrogen compounds in dairy cows fed urea as the sole or partial source of nitrogen . Agricultural and Food Science, [S. l.], v. 48, n. 4, p. 323–335, 1976. DOI: 10.23986/afsci.71921. Disponível em: https://journal.fi/afs/article/view/71921. Acesso em: 19 may. 2024.