On the Transference of Bacterial Antibodies from the Hen to the Chick

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Abstract
The sera and egg yolks of hens naturally infected with Salmonella gallinarum or inoculated intraven. with killed S. pullorum contain similar titers of non- agglutinating antibody. If, however, the inoculation is intramusc. or subcut., little antibody can be found in the yolks. This suggests that some of the antibody in the yolk may have been produced by ovarian tissue. Antibodies pass from the hens to the chicks via the egg yolks and may be detected in the embryonic serum after the 11th day of incubation. They are absorbed through the vitelline and hepatic portal circulations.