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  • Title: Experimental infection of laying chickens with egg-drop syndrome 1976 virus.
    Author: Higashihara M, Hiruma M, Houdatsu T, Takai S, Matumoto M.
    Journal: Avian Dis; 1987; 31(1):193-6. PubMed ID: 3034229.
    Abstract:
    Brown layer hens (BC and HC strains) and white layer hens (WL strain) orally infected with the H-162 strain of the egg-drop syndrome 1976 virus developed few clinical signs except for abnormal egg production. Depressed and/or aberrant-egg production was observed for 3 days or longer in 17 of 18 BC hens, 13 of 15 HC hens, and 10 of 17 WL hens. On the average, abnormal egg production began 8.8, 10.3, and 12.2 days after infection of the BC, HC, and WL hens, respectively. Egg production was depressed in the WL hens, but little depression was observed in the BC and HC hens. Aberrant-egg production was much less frequent in the WL hens than in the BC and HC hens. Aberrant eggs were shell-less, soft-shelled, thin-shelled, and/or discolored. No eggs of abnormal internal quality or shape were observed. The virus spread from infected BC and WL hens to contact hens.
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