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. 2021 Mar 31;12:585089. doi: 10.3389/fphys.2021.585089

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Copyright © 2021 Wu, Lin, Chen, Luo, Nie, Zhang and Luo.

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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Characteristics of skin yellowness in Ma-Huang chickens. (A) schematic diagram of the positions at which skin yellowness was determined. (B) the b* value distribution for different body parts. (C) 3D Scatterplot of Hue vs saturation vs Value of skin color in Ma-Huang chickens (Rotate different angles along the Z axis). All samples were superimposed on the color space according to the hue, value and saturation values derived from the skin area assessed in digital photographs. According to the HSV ranking, the individual’s visual perception is divided into 3 parts, followed by nearly white (blue dots), pale yellow (red dots), and yellow (green dots). n = 360. (D) examples of skin photographs corresponding to the hue-saturation color space.