As previously reported in other tissues (Hyun and Hong, 2017; Girbl et al., 2018; Sekheri et al., 2021), CXCL1 (KC), CXCL2 (MIP2), ICAM-1, ACKR1, Selp (P-selectin), and Itgam (Cd11b), are all most probably involved in transendothelial neutrophil trafficking in mastitis. Here, ACKR1 is linked to mastitis.