Technical options for the mitigation of direct methane and nitrous oxide emissions from livestock: a review

P.J. Gerber, A.N. Hristov, B.L. Henderson, H.P.S. Makkar, J. Oh, C. Lee, R. Meinen, F. Montes, T. Ott, J. Firkins, A. Rotz, C. Dell, A.T. Adesogan, W.Z. Yang, J.M. Tricarico, E. Kebreab, G. Waghorn, J. Dijkstra, S.J. Oosting