Funding for this research was provided by:
Svenska Forskningsrådet Formas (DNR 942-2015-1015)
Received: 15 November 2018
Accepted: 13 September 2019
First Online: 2 October 2019
Ethics approval and consent to participate
: All the old blood samples and frozen DNA samples were already available in our laboratory; in fact, some of these samples had already been used for microsatellite analysis in previous studies, and therefore, no ethical approval was needed to use them. However, consent from cattle owners was obtained before collecting the nasal swabs from their animals, after being informed about the planned research on their livestock.
: Not applicable.
: The authors declare that they have no competing interests.