Growth of Newcastle disease virus in fertile eggs of the Japanese quail ( Coturnix coturnix japonica)

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Five strains of Newcastle disease virus (NDV) were inoculated into the allantoic cavities of six-day fertile quail eggs and nine-day fertile hen eggs. The mean embryo infective dose (EID 50) was higher and the mean embryo death time (EDT 50) was shorter in quail eggs than in hen eggs. The F strain killed all the quail embryos, but hardly any chick embryos. The HA and EID 50 titres of allantoic fluids were higher from hen eggs than from quail eggs. It is considered that fertile quail eggs have some advantages over hen eggs for use in the virological laboratory.