Abstract
Four component lines of a commercial broiler stock were analyzed by restriction fragment length polymorphism (RFLP) analysis, for the presence of endogenous avian leukosis virus loci. The resulting RFLP patterns of endogenous virus (ev) loci for the four strains were further characterized in terms of number of loci per animal and frequency. Loci were also analyzed within limits for major structural alterations and deletions to discern whether certain loci were similar to previously identified loci in White Leghorn layer birds. The ev RFLP patterns for these broiler lines were found to be highly complex and contained many loci unreported in White Leghorn layer birds.
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