Abstract
Cole (1968) recently reported that hereditary differences among existing strains of White Leghorns, among sire and dam families within strain and between lines selected for resistance to Marek's disease (MD) are so great that the use of genetic resistance appears to offer an excellent method for its control. He concluded that by using the JM strain of Marek's disease, resistant sire families can be identified with a fair degree of accuracy without the postmortem examination. The purpose of this report is to provide information on the relative differences in resistance to MD as measured by mortality and lesions of the Athens-Canadian randombred (ACRB) stock inoculated with the GA isolate of MD.METHODSA parental population was obtained using 1,400 one-day-old pedigree chicks, representing 30 single sire families of the ACRB population (Hess, 1962). These chicks were injected intra-abdominally with 0.1 ml. of GA-infective plasma (Eidson and Schmittle, 1968). Birds dying .
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