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. 2020 Feb 7;52:6. doi: 10.1186/s12711-020-0525-z

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© The Author(s) 2020

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 — Distributions of horn phenotypes. a Total number of animals in the horn phenotype categories: smoothly polled, small frontal bumps, frontal bumps and scurs. b Proportion of male and female cattle in the horn phenotype categories: smoothly polled, small frontal bumps, frontal bumps and scurs, with number of males = 66 and number of females = 683. c Proportion of heterozygous polled animals carrying the Friesian (P_F/p, n = 615) or the Celtic (P_C/p, n = 53) polled variant and homozygous polled animals carrying the Friesian polled variant in homozygous state (P_F/P_F, n = 43) and carrying one Friesian and one Celtic polled variant (P_F/P_C, n = 10) in the different horn phenotype categories (smoothly polled, small frontal bumps, frontal bumps and scurs)