B. G. Alves, C. M. de M. R. Martins, D. de O. Sousa, M. A. Arcari, F. P. Rennó, and M. V. Santos, “Levels and degradability of crude protein in digestive metabolism and performance of dairy cows”, Braz. J. Vet. Res. Anim. Sci., vol. 57, no. 3, p. e168157, Oct. 2020, doi: 10.11606/issn.1678-4456.bjvras.2020.168157.