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. 2018 May 16;9:39. doi: 10.1186/s40104-018-0254-0

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Relationship between heat production and metabolizable energy (ME) intake. HP₀ = Extrapolated total heat production at zero energy intake. FHP 1 corresponds to the FHP measured with animals receiving the highest feed level and FHP2 corresponds to the FHP measured with animals receiving the lowest feed level. The slope of line B = HI:ME. The complement of the slope of line B is k_g (NE:ME). The slope of line A = (HIi:ME). The complement of the slope of line A is k_m (NE_m: ME), k_m > k_g (adapted from Labussière et al. [23]; Noblet and van Milgen, [20]). FHP: Fasting heat production; HI: Heat increment; k_m: Efficiencies of energy utilization for maintenance; k_g: Efficiencies of energy utilization for growth; ME_m: Metabolizable energy requirements for maintenance; NE: Net energy; NE_m: Net energy requirements for maintenance