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The weights of the bursa of Fabricius and spleen of a strain of chicks resistant to Salmonella pullorum were compared with those of a susceptible one and the relationships of bursa and spleen weights to antibody production were investigated.No significant differences of bursa weights between these strains were detectable at hatching and 2 weeks of age. Larger spleens were shown at hatching in the resistant strain, but at 2 weeks of age in the susceptible strain. There were no relationships of the weight of the bursa and spleen to antibody titers and also no difference in antibody titers between the two strains. These results suggest that bursa and spleen weights are not related to susceptibility to Salmonella pullorum.

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The Relationships of the Weights of the Bursa of Fabricius and Spleen to Susceptibility and Antibody Production to &lt;i&gt;Salmonella Pulloyum&lt;/i&gt;