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The present investigation was carried out to determine whether Japanese quail had any hereditary factor to participate in their susceptibility to REV-T. The susceptibility was compared among families of Japanese quail.1. Of the 275 birds, 170 died by 21 days post inoculation, showing a mortality of 61.8 per cent. The average number of days of survival was 15.1 days.2. The mortality in each family was scattered within a range from 20.0 to 90.9 per cent. The χ2 test indicated that there were significant differences in the mortality among the families.3. The average number of days of survival in each family was dispersed within a range from 10.7 to 19.5 days. The F test revealed that there were significant family differences in the average number of days of survival.4. The difference in mortality between two groups (low and high susceptibility) derived from the difference in the number of death occurring in the early stage of infection up to 14 days post inoculation, and in the time of appearance of a peak of death between these families.5. It was presumed that some hereditary factors might have participated in susceptibility to REV-T, and that one of the most remarkable differences between the family group showing low susceptibility and that showing high susceptibility may consist in the early stage post inoculation.

Comparison of Susceptibility to the T Strain of Reticuloendotheliosis Virus among Families of Japanese Quail