Abstract
Genetic susceptibility to RSV(RAV-0), an avian sarcoma virus belonging to subgroup E. has been studied in two sets of inbred chicken lines. Data from the Reaseheath lines suggested that a recessive gene, independent of susceptibility to subgroup B, controlled resistance to subgroup E virus. This gene was assumed to be a new tve locus. Studies of the Regional Poultry Research Laboratory (RPRL) lines suggested that a recessive gene for resistance was located at the tvb locus and thus genetically linked to resistance to subgroup B virus. Crosses and backcrosses of Reaseheath and RPRL lines were assayed for susceptibility to RSV(RAV-0) and RSV(RAV-2) on the chorioallantoic membrane. The data completely support the hypothesis that a single locus controls recessive resistance to subgroup B and E viruses. Therefore, there was no evidence for an independent tve locus.
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