Rodríguez, A. A., E. M. Martínez, L. C. Solórzano, and P. F. Randel. “Intake and Digestibility by Lambs of a Diet of Tropical Grass and Hyparrhenia Rufa Hays With a Probiotic Containing Bacillus Licheniformis and Bacillus Subtilis”. The Journal of Agriculture of the University of Puerto Rico, vol. 98, no. 2, Oct. 2014, pp. 147-68, doi:10.46429/jaupr.v98i2.2515.