Comparison of Tier 1 and 2 methodologies for estimating intake and enteric methane emission factors from smallholder cattle systems in Africa: a case study from Ethiopia von Gurmu, E.B., Ndung'u, P.W., Wilkes, A., Getahun, D., Graham, M.W., Leitner, S.M., Marquardt, S., Mulat, D.G., Merbold, L., Worku, T., Kagai, J.G., Arndt, C.

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