Article History
Received: 17 October 2018
Accepted: 11 February 2019
First Online: 23 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Blood sampling from chicken has been conducted in compliance with the current European and national legal requirements under registration and permission by the responsible authority (Landesdirektion Leipzig, file no. V 10/14).