A sample of 103 Fayoumi chicks and 50 White Leghorn chicks were challenged at 18 days of age by Marek's disease virus. The Fayoumi strain was segregating for endogenous viral loci, including ALVE6 which could have unfavorable effects on immune response. Incidence of the disease was much lower in the Fayoumi (43%) as compared to the White Leghorn control (76%) but was not affected by ALVE6. Affected Fayoumi chicks died 30 days later than the controls, whatever their genotype for ALVE6

M. Tixier-Boichard, J. L Monvoisin, M. Morisson, J. L Coville, H. le Coq, M. Guittet

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 27: Reproduction; fish breeding; genetics and the environment; genetics in agricultural systems; disease resistance; animal welf, , 370–373, 1998
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