DNA sequences related to avian leukosis virus have been identified in the genome of chickens from a Fayoumi strain, kept with a random mating system, and 2 Rhode Island Red lines, divergently selected on residual feed intake. Digestion with Sac! enzyme and hybridization with RAV-2 sequences showed 14 different bands in the Fayoumi and 8 in the RIR. Inheritance pattern of the bands was consistent with the existence of one endogenous viral locus per band. The Fayoumi showed a higher variability for the number of bands per animal (from 0 to 7) than the RIR lines (from 3 to 7). Level of heterozygosity appeared also higher in the Fayoumi. Such observations might be related to different genetic origins and selection objectives between the 3 populations. Comparison with the classification known in White Leghorns was not straightforward, further analysis of DNA polymorphism and viral expression are needed.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 143–146, 1990
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