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. 2021 Jun 30;22:487. doi: 10.1186/s12864-021-07822-9

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 2 — Histomorphology of bone located in knob between knob- and non-knob geese. A-C Right latero-lateral radiograph images of heads of different geese breeds. The position of bone protuberances was red circled. D-F Low-magnification photomicrograph of HE-stained bone. Black arrow, external periosteum; green arrow, internal periosteum. Scale bar: 200 μm. G-I High-magnification photomicrograph of HE-stained bone. Black arrowhead, osteocyte; double-arrow, the connective tissue; #, cartilage tissue. Scale bar: 50 μm. J-K The calcification degree and width of the knob bone in different geese breeds. The data of L was used for normalization of the data of both S and W, and the data was displayed as multiples of changes. * represented the statistically significance. P < 0.05. S, Lion head goose; W, Sichuan White goose; L, Landes goose. S and W are with knob, L is devoid of knob