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Changes in plasma concentration of (a) interferon-gamma (IFN-γ) and (b) interleukin (IL) 4 in calves throughout their first 4 weeks of life, according to their classification in the oxidant status index (OSi) groups (n = 6/group). The “low OSi” group includes the 6 calves with the lowest average OSi values based on weekly measurements. Results are expressed as estimated means ± SE. * p < 0.05, ** p < 0.01.
