Funding for this research was provided by:
Narodowe Centrum Nauki (MAESTRO No2011/02/A/NZ5/00338)
Ministerstwo Nauki i Szkolnictwa Wyższego (005/RID/2018/19)
Received: 27 February 2020
Accepted: 8 September 2020
First Online: 17 September 2020
Ethics approval and consent to participate
: All procedures for collection of tissues were accepted by the Local Ethics Committee for Experiments on Animals in Olsztyn, Poland (Agreements No. 51/2011). All contests were given by the abattoir (AF/114/2013 from 26.06.2013) and State Veterinary Inspection (Decision no. PIW.pl.0740.41.2014 from 24.04.2014) to take tissue samples from slaughtered animals.
: Not applicable.
: The authors have declared no competing interests.