Funding for this research was provided by:
Horserace Betting Levy Board
Received: 7 November 2017
Accepted: 10 January 2018
First Online: 25 January 2018
Ethics approval and consent to participate
: This study was approved and carried out in strict accordance and compliance with the guidelines of the Institutional Ethical Review Committee, Department of Veterinary Medicine, University of Cambridge, UK (Research Project No. CR190). Written informed consent was obtained from the stud farm from which study samples were collected.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.