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Efficiency of energy use for maintenance (km) vs. dietary energy density (M/D, MJ/kg DM) for sheep data as summarized in the review of Clayton et al. (2022) and an estimate of km above maintenance (1 − HAF/MEI) calculated from the data of Hegarty et al. (1999) and Dougherty et al. (2022) using the methods described in this paper.
