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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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Gonadotrophin-Inhibiting Hormone (GnIH; A) and Gonadotrophin-Releasing Hormone I (GnRH-I; B) mRNA expression levels in Lohmann, Shaver, and Smoky Joe hens at 12, 17, 20, 25, 45, 60, 75, and 100 woa. (C) Ratio between GnRH-I and GnIH mRNA levels. p-values for the sources of variation of age by strain: (A) Lohmann, p = 0.0766; Shaver, p = 0.1713; and Smoky Joe, p = 0.0941. (B) Lohmann, p = 0.0155; Shaver, p = 0.0026; and Smoky Joe, p = 0.0684. (C) Lohmann, p = 0.0025; Shaver, p = 0.0037; and Smoky Joe, p = 0.0006. ^A,B,CData points lacking the common superscript differ significantly within the ages of each strain, while no superscript did not differ from any other time point in that strain.