What factors must be taken into account for the maintenance of the immunogenicity of ovalbumin antigen?
Ovalbumin is frequently used in immunology to induce an immune response (see some publications about mice and ovalbumin here.
You usually inject it together with an adjuvans to enhance the reaction. The factors that must be taken into account for its maintainance are the same as for the other antigens, so you should boost this "vaccination" from time to time.