Funding for this research was provided by:
Landwirtschaftliche Rentenbank, Bundesanstalt für Landwirtschaft und Ernährung (28-RZ-3.051, AMIKOS 28-RZ-3.054, 28-RZ-3.053)
Received: 6 August 2020
Accepted: 9 September 2020
First Online: 18 November 2020
Ethics approval and consent to participate
: All procedures involving animals were carried out in accordance with guidelines and regulations from the European Commission Directive for Pig Welfare and were approved by the institutional animal welfare committees of the Institute for Reproduction of Farm Animals Schönow and of the University of Veterinary Medicine Hannover (TVO-2019-V-20).
: Not applicable.
: The authors declare that they have no competing interests.