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. 2016 Mar 23;3(3):150408. doi: 10.1098/rsos.150408

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© 2016 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — Experiment 1. (a) N intake (x-axis) versus N excreted (y-axis) for pigeons (n = 5) when fed the three CP diets (triangles = 6%, squares = 10%, circles = 14%). The broken line indicates the regression equation: y = 0.64x + 145.4 (r² = 0.951, p < 0.001). The solid line indicates the zero N balance line. (b) Relationship between N intake (x-axis) and N balance (y-axis) of pigeons when fed the three CP diets. The solid line indicates the linear regression line and the broken lines indicate the 95% CIs. Regression equation is y = 0.36x – 145.4 (r² = 0.863, p < 0.001).