Abstract
The tumor incidence and mortality of Marek's disease (MD) were determined for 471 progeny from four pairs of lines two-way selected for different immunological characters: graft versus host reaction (GVHR) competence, IgG levels, antibody response to rabbit serum albumin (RSA), and anaphylactic shock to BSA. All chicks were inoculated at 1 wk of age with 1 to 2 × 106 viable cells of a MD lymphoblastoid cell line, MDCC-MSB1-41C (41 C). Tumor incidence differed significantly between the high (H) and low (L) lines of each GVHR-, IgG-, RSA-, or BSA-selected group. There were also significant differences in mortality rates between H and L lines of all selected groups. The IgG-H, BSA-H, and RSA-H lines were more resistant than their respective L lines. The H line of the GVHR-selected lines was more susceptible than the L line. Tumor regression could be detected only in the IgG- and RSA-selected lines. No definite correlation could be found between genetic resistance to 41C and genetic resistance to MD virus.
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