Transcription of IL‐6 gene increased along with the increase in inflammation severity, which is in line with recent studies, as it is one of the most important cytokines in endometritis development (Fumuso et al., 2003; Woodward et al., 2013; Christoffersen & Troedsson, 2017; Skarzynski et al., 2020). This evidence concerns the gene IL6 and endometritis.