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. 2021 Mar 25;12:651491. doi: 10.3389/fphys.2021.651491

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Copyright © 2021 Hanlon, Takeshima and Bédécarrats.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The rate of egg production in Lohmann, Shaver, and Smoky Joe hens up to 100 woa (A), along with an emphasis on production from 17 to 26 woa (B), and the associated percentage of hens in each strain, which have initiated lay per week (C). p-values for the sources of variation: Age, p < 0.0001; Strain, p < 0.0001; and Age*Strain, p < 0.0001. ^A,B,CData points lacking the common superscript in (B) differ significantly within the ages of each strain, while no superscript indicates no difference from any other strain at that time point.