Funding for this research was provided by:
Bundesanstalt für Landwirtschaft und Ernährung (740718)
Received: 5 July 2019
Accepted: 20 January 2020
First Online: 31 January 2020
: This study was evaluated and approved by the ethics committee of the University of Veterinary Medicine, Hannover. The experiment was conducted between January and September 2016 under the approval of the Lower Saxony Federal State Office for Consumer Protection and Food Safety (reference number 33.12–42502–04-15/2024; Approval date: 15th December 2015).All ethical evaluations were performed as required by the German Animal Care law and associated legislative regulations (“Tierschutzgesetz”, ExternalRef removed).
: Not applicable.
: The authors declare that they have no competing interests.