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. 2014 Oct 31;26(1):269–281. doi: 10.1093/beheco/aru186

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© The Author 2014. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Scatter plot of cortisol concentrations in milk at early (A) and peak (B) lactation as well as the calculated change (Δ) per day between the 2 time points (C) by maternal parity. Fitted regression line in black.