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Antibody response to immunization with keyhole limpet hemocyanin (KLH). Piglets were immunized with KLH at 6 to 7 (○) and 27 to 28 (△) d of age, as indicated by vertical arrows. KLH-specific IgG titers are shown as the base-2 logarithm after adding 1 to the original values to demonstrate a base line at 0. Vertical bars represent the standard error of the mean (SEM) of a given group on a specific sampling day. Means of each group are connected by a line.
