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. 2021 Mar 10;11(3):763. doi: 10.3390/ani11030763

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scatterplot of the first two relative warp scores (RWs) considering the back posture of each individual horse. The three different colors describe the data obtained for three different feeding positions: red, on the ground—control position (CP); green, neck held 15 ± 3° below withers height with low hay net position (LP); and blue, neck held 15 ± 3° above withers height with high hay net position (HP). Principal component analysis (PCA) based on the first two RWs (RW 1 and RW 2) describes the percentage of the overall shape variation: 92.89% for ID 1; 97.02% for ID 2; 95.89% for ID 3; 87.04% for ID 4; 95.71% for ID 5; and 92.78% for ID 6.