Gender differences in total antibody (AbTot) and IgG titers, and mitogen stimulation index (MSI) after non-infectious challenges with sheep red blood cells (SRBC) and phytohemagglutinin (PHA), respectively.

a-b Within row, values with the same letter are not significantly different (P>0.005).Values are expressed as means ± standard deviation: titer as log2 of the reciprocal of the greatest dilution causing visible hemagglutination; skin thickness in cm.