Funding for this research was provided by:
Narodowe Centrum Nauki (2013/09/B/NZ6/03514)
Krajowy Naukowy Osrodek Wiodacy (UMO-KNOW/2016/SGGW/PRO1/01/3)
Received: 20 April 2020
Accepted: 15 September 2020
First Online: 21 September 2020
Ethics approval and consent to participate
: Blood collection was the only invasive procedure in this study. It was carried out as a part of voluntary CAE surveillance and was approved by the 3rd Local Ethical Committee in Warsaw, Poland (Approval No. 31/2013, 22 May 2013).Written permission to collect study samples was granted by the formal owner of the Experimental Farm of the Institute of Genetics and Animal Breeding of Polish Academy of Sciences.
: Not applicable.
: The authors declare that they have no competing interests.