Figure 1

Overview of strain growth (optical density, OD600) over 24 h in different growth media. The four field strains, Staphylococcus chromogenes from composite cow milk (CCM) and from bulk tank milk (BTM) (A, B) and S. equorum from CCM and BTM (C, D), and the two comparative strains, Staphylococcus chromogenes isolates from a persistent intramammary infection (IM) and from the teat apex of a dairy heifer (TA) (E, F), are grown in tryptic soy broth (TSB, solid line), deferrated tryptic soy broth (dTSB, dotted line), deferrated tryptic soy broth with ferritin from equine spleen (dTSBF, short-dash line), and deferrated tryptic soy broth with human recombinant lactoferrin (dTSBL, long-dash line). All experiments were performed in duplicate. Different letters within each figure (A–C) indicate significant differences when applying the Bonferroni correction between growth media within strains (P ≤ 0.05).