Susceptibility of Various Parental Lines of Commercial White Leghorn Layers to Infection with a Naturally Occurring Recombinant Avian Leukosis Virus Containing Subgroup B Envelope and Subgroup J Long Terminal Repeat

Chickens from seven different parental lines of commercial White Leghorn layer flocks from three independent breeders were inoculated with a naturally occurring avian leukosis virus (ALV) containing an ALV-B envelope and an ALV-J long terminal repeat (LTR) termed ALV-B/J. Additional groups of chickens from the same seven parental lines were inoculated with ALV-B. Chickens were tested for ALV viremia and antibody at 0, 4, 8, 16, and 32 wk...