In a previous study we had found that the ovalbumin-specific production of IL-17A and IFN-γ correlated with the milk leukocytosis induced by the infusion of ovalbumin in the mammary gland of sensitized cows, and thus that the antigen-specific WBA could be used as a predictor of mASR [18]. This evidence concerns the gene IL17A and Increased total leukocyte count.