In our study, we found no expression differences for major chemokines such as il-1β, tumour necrosis factor alpha (tnfα), il-6 and il-8 (also named cxcl8, one of the main chemoattractants for neutrophils [4]), contrary to Griesbeck-Zilch in MEC of mastitis resistant cows selected on QTL alleles [31]. The gene discussed is TNF; the disease is mastitis.