Influence of the Administration of Bursa of Fabricius Extract and Anti-bursal Extract Serum on Antibody Formation

Abstract

Administration of bursal extract to chickens made immunologically deficient by treatment with cyclophosphamide did not restore immunological competence. Administration of anti-bursal extract serum did not influence antibody formation (agglutinin titre) to sheep red blood cells. These results do not support the presence of hormones, such as bursopoietin, in the bursa of Fabricius.