Received: 14 November 2019
Accepted: 30 June 2020
First Online: 17 July 2020
Ethics approval and consent to participate
: The Ethical and Administrative Committee of the Department of Veterinary Clinical Sciences, University of Copenhagen approved the study (reference number: 2017–002). Horse-owners of enrolled stallions signed an informed consent form.
: Not applicable.
: The authors declare no conflicts of interests.