Higashihara M, Hiruma M, Houdatsu T, Takai S, Matumoto M
Avian Dis. 1987 Jan-Mar;31(1):193-6.
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.
用1976年产蛋下降综合征病毒H - 162株口服感染褐壳蛋鸡（BC和HC品系）和白壳蛋鸡（WL品系），除产蛋异常外，很少出现临床症状。18只BC品系母鸡中有17只、15只HC品系母鸡中有13只、17只WL品系母鸡中有10只出现产蛋量下降和/或产异常蛋，持续3天或更长时间。平均而言，BC、HC和WL品系母鸡分别在感染后8.8天、10.3天和12.2天开始出现异常产蛋。WL品系母鸡的产蛋量下降，但BC和HC品系母鸡产蛋量下降不明显。WL品系母鸡中产异常蛋的情况比BC和HC品系母鸡少得多。异常蛋有无壳、软壳、薄壳和/或变色的情况。未观察到内部品质或形状异常的蛋。病毒从感染的BC和WL品系母鸡传播到接触的母鸡。
