Effect of Yerba Mate Extract as Feed Additive on Ruminal Fermentation and Methane Emissions in Beef Cattle oleh Yuli A. Pena-Bermudez, Rafaela Vincenzi, Paulo Meo-Filho, Leandro S. Sakamoto, Richard Lobo, Gabriela Benetel, Annelise Lobo, Carol Matos, Vanderlei Benetel, Cesar G. Lima, Alexandre Berndt, Laura M. Cardenas, Ives C. S. Bueno