Bachruddin, Z. et al. 2019. Effect of the Addition of Sodium Nitrate in a Total Mixed Ration with Fermented Tofu Waste on Methane Production from the Rumen Fluid. Pakistan Journal of Nutrition. 18, 5 (Apr. 2019), 408–412. DOI:https://doi.org/10.3923/pjn.2019.408.412.