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Additional Information

Competing Interests

Hilary M Clayton is President of Sport Horse Science, LC, Michigan and Sport Horse Publications. The authors declare that they have no competing interests.

Author Contributions

Sarah Jane Hobbs conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, prepared the supplementary information.

John E A Bertram analyzed the data, wrote the paper, reviewed drafts of the paper.

Hilary M Clayton conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

The study was performed with approval from the institutional animal care and use committee, Michigan State University, USA under protocol number 02/08-020-00.

Data Deposition

The following information was supplied regarding data availability:

The raw motion files (in CMO format) are available at: http://dx.doi.org/10.17030/uclan.data.00000040

These can be viewed using a free CMO Reader available to download from c-motion inc. at: http://www2.c-motion.com/free

We have also included Excel spreadsheets for both datasets of the metrics. These can be found at: http://dx.doi.org/10.17030/uclan.data.00000040

Funding

The resources needed to complete this work were provided by the University of Central Lancashire, the Mary Anne McPhail Equine Performance Center and the University of Calgary. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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