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20 chicken fattening flocks in one business were tested for their production succsess and for their immune status against Infectious Bronchitis (IB) and Newcastle Disease (ND). The individual production values are shown together in a production parameter. To determine the serological status 30 or 31 blood samples were taken on the first day of live, on 21st day, and on the last day of fattening.Neither in the MANN WHITNEY test nor in the quality correlation SPEARMANN est was an obvious connection visible between the serology and production. There was, however, a significant correlation between the fattening results and the changed immunisation programme against IB during the observation period in the MANN WHITNEY test. In the rearing of immunised flocks, there were always better production results than with nonimmunised flocks. This could be a sign of a locally occurring virus infection.The previously carried-out ELISA test give an important idea of the cause of the disease development in the first flocks who, without immunisation against IB during their rearing, would indicate humeral antibodies at the end of fattening. With this knowledge, other specific measures could be linked directly to causative agens and after the diagnosis, a suitable immunisation programme would improve not only the animals health but also the production results.The different antibody development against both diseases cannot be explained by differing high maternal antibodies or different immunisations times. Without taking consideration immune-suppressive diseases, witch showed no symptoms during the course of fattening, the carrying though of the vaccination programme must be come into question as a cause of the non-uniform and inconsistent antibody development.