KREULA, M.; ETTALA, T. Digestibility and nitrogen balance of the feed of dairy cows with urea as the sole or partial source of nitrogen . Agricultural and Food Science, [S. l.], v. 49, n. 3, p. 192–198, 1977. DOI: 10.23986/afsci.71935. Disponível em: https://journal.fi/afs/article/view/71935. Acesso em: 23 nov. 2024.