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SummaryEmbryos of the highly inbred Reaseheath W line were found to be resistant to RSV (RAV-O), a subgroup E virus. The results of test-cross matings between this line and the inbred Reaseheath I and C lines confirmed the two-loci genetic model reported previously by us for inheritance of response of fowl to RSV (RAV-O). Two loci were postulated in this model. Inhibitore, with resistance Ieallele dominant over ie, and tumour virus e (tve), with susceptibility allele esdominant over resistance allele er. Ieis epistatic to es, inhibiting its expression. The genotype of the W line was typified as IeIeerer, a third type of resistance (Type III), and the first two types, IeIeesesand ieieerer, were reported in our previous communication for the I and C lines, respectively.It was found in certain crosses that embryos resistant to subgroup B virus were also resistant to RSV (RAV-O), but embryos susceptible to subgroup B virus were found segregating for resistance to subgroup E virus. This type of segregation failed to support the concept advanced by other workers that the association between the two types of resistance was dependent on genes at the tvb locus.

journal of general virology

Studies in Genetic Resistance to RSV (RAV-O): A third type of Genetic Resistance typified by the W Line of Fowl and further support for the Two Loci Genetic Model