Funding for this research was provided by:
Svenska Forskningsrådet Formas (dnr 2016-01118)
Received: 4 March 2020
Accepted: 15 June 2020
First Online: 24 June 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee for Animal Experimentation, Uppsala, Sweden (Dnr 5.8.18-15404). Informed consent from the farmers was obtained before the collection of samples and production data from the herds.
: Not applicable.
: The authors declare that they have no competing interests.