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. 2021 Jun 14;12:685968. doi: 10.3389/fphys.2021.685968

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Copyright © 2021 Fan, Liu and Zhou.

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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The varying degrees of gait changes in broilers with FHN. Gait score of 0 (A) The bird walked normally, with no detectable abnormality; Gait score of 1 (B) The bird had a slight defect, which was difficult to define precisely; Gait score of 2 (C) The bird had a definite and identifiable defect in its gait; Gait score of 3 (D) The bird had an obvious gait defect, which affected its ability to move about; Gait score of 4 (E) The bird had a severe gait defect; Gait score of 5 (F) The bird was incapable of sustained walking on its feet.