Kinetics of IgY Formation after Immunisation of Hens with Different Protein Antigens.

Hens (White Leghorn) were immunized with different protein antigens and antibodies were isolated from eggs by PEG precipitation. To determine experimental conditions under which optimal antibody titers are reached the antigen dose and the mode of application were varied. Injecting the antigen three times every four weeks in the absence of adjuvant led to a phase like immune response. A plateau of the antibody titer was only reached when immunization was carried out in the presence of adjuvant. Antibody titers obtained from mammalian sera are equally high as those obtained from hen eggs. To label isolated IgY preparations with horse radish peroxidase no further purification or concentration steps are necessary.