Funding for this research was provided by:
Volkswagen Foundation (ZN 1294, ZN2168)
Deutsche Forschungsgemeinschaft (38028266)
Received: 2 December 2019
Accepted: 27 March 2020
First Online: 17 June 2020
Ethics approval and consent to participate
: As all tissue samples from cattle were obtained either during cullings ordered by the government (according to Regulation (EC) No 999/2001) or the regular slaughtering process at the abattoir, an ethics approval was not necessary. The project was approved by the governmental authorities of the Land Niedersachsen and a collaboration with the Lower Saxony State Office for Consumer Protection and Food safety (LAVES) took place during the whole process of sample collection.
: The authors declare that they have no competing interests.