Pedreira, Márcio dos Santosde Oliveira, Simone GiselePrimavesi, Odode Lima, Magda AparecidaFrighetto, Rosa Toyoko ShiraishiBerchielli, Telma Teresinha [UNESP]2014-05-272014-05-272013-08-01Revista Brasileira de Zootecnia, v. 42, n. 8, p. 592-598, 2013.1516-35981806-9290http://hdl.handle.net/11449/76189Using sorghum silage, the effect of roughage/concentrate ratios was evaluated on nutrient intake, digestibility, ruminal parameters and methane production by beef cattle. Three treatments (0, 30 and 60% of concentrate in DM of the diet) were distributed in three Latin squares, with nine animals and three periods. Dry matter intake increased as the grain concentration in diet increased; pH showed opposite behavior. Methane emissions were lower for animals fed the diet exclusively with sorghum silage as compared with those fed 30% of concentrate, but was similar to that of animals receiving 60% of concentrate. Losses of ingested gross energy as methane were reduced by 33% when grain concentration was increased in the diet. Concentrations of propionic and butyric acids were greater in diets with grain concentrate; acetic acid concentration was not affected. Concentrate in diet increases available energy for the metabolism, measured by lower losses of ingested gross energy as ruminal methane. © 2013 Sociedade Brasileira de Zootecnia.592-598engGlobal greenhouse gasesNutritional valueRumen fermentationSF6Artigo10.1590/S1516-35982013000800009S1516-35982013000800009WOS:000322317600009Acesso aberto2-s2.0-848814845432-s2.0-84881484543.pdf5317385915649516