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. 2017 Feb 23;14:11. doi: 10.1186/s12983-017-0200-6

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Body (a) and testicular weights (b), and testicular histological data (c-f) of Yangzhou ganders maintained under two artificial photoperiods. Changes in the diameter of the seminiferous tubules (c), the number of spermatogonia (d), spermatocytes (e), and elongated spermatids (f) were measured within 8 individial seminiferous tubules. Each bar represents the mean value of six determinations including the standard error. *, ** and *** indicate statistical significance based on P < 0.05, P < 0.01 and P < 0.001, respectively