The authors wish to add the following to this paper [1]:
Institutional Review Board Statement
The study was conducted in accordance with the German Animal Protection Act (implementing the Directive 2010/63/EU on the protection of animals used for scientific purposes) and the Guidelines for the Ethical Treatment of Animals in Applied Animal Behaviour and Welfare Research of the International Society for Applied Ethology (2017). The birds were reared and kept for production for human consumption according to national law and guidelines, and not for experimental purposes. They did not undergo any experimental procedures and were only monitored by non-invasive clinical scoring and behavioural observations. The observational protocol was approved by the Designated Veterinarian for Institutional Animal Care at the University of Kassel.
Reference
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