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Agglutinating antibody titers against C. perfringens in the offspring's blood plasma. Offspring received an oral inoculation of C. perfringens at d 14. Blood plasma was collected at d 14 (before infection), d 21 and d 35 of age and subjected to an agglutination assay. Each bar represents the mean of agglutinating antibody titers ± SEM with N = 30 animals per treatment. * P < 0.05; ** P < 0.01; *** P < 0.001.
