RUIZ, T. M.; CANCEL-MEDINA, E. Performance of Holstein cows fed two levels of concentrate supplementation and ruminally undegraded protein. The Journal of Agriculture of the University of Puerto Rico, [S. l.], v. 90, n. 1-2, p. 9-26, 2006. DOI: 10.46429/jaupr.v90i1-2.2958. Disponível em: https://revistas.upr.edu/index.php/jaupr/article/view/2958. Acesso em: 27 jan. 2022.