Funding for this research was provided by:
Landwirtschaftliche Rentenbank (FKZ 28-RZ-3-72.038)
Rheinische Friedrich-Wilhelms-Universität Bonn
Received: 25 May 2021
Accepted: 31 January 2022
First Online: 19 February 2022
: All applicable international, national, and institutional guidelines for the care and use of animals were followed. Animals were reared within the BHZP nucleus herds in compliance with national regulations pertaining to livestock production and according to the procedures approved by the German Animal Protection Law (TierSchG). These animals are not considered as experimental animals as defined in EU directive 2010/63 and the Animal Protection Law (TierSchG). Blood sampling was performed by veterinarians as part of the routinely health and hygiene monitoring of the BHZP nucleus herds according to the Pig Keeping Hygiene Requirements Ordinance (SchHaltHygV) §7 (1) Sentence 2. No ethical approval was required for this study.
: Not applicable.
: The authors declare that they have no competing interests.