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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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Estradiol concentration of Lohmann, Shaver, and Smoky Joe hens from 12 to 100 woa. (A) Average E₂ concentration per strain ± SEM. Predicted smoothed curve for Lohmann (B), Shaver (C), and Smoky Joe (D) hens ±95% CI.