The eggs of Japanese pharaoh quail were incubated in uniformed conditions subjecting them to a short 2 hours’ influence of a static magnetic field of 225 mT in supposed critical points of embryogenesis for this kind of birds, i.e. 3rd, 5th and 14th incubation day. The experiment was conducted twice with a control group, using eggs from two production stages of the parental flock – the peak and the end. It has been shown that the subjection of eggs in incubation period to a short influence of 225 mT high-induction static magnetic field caused small but observable changes in the hatchings. The magnetic “shock” applied in the 3rd stage of incubation caused a slight decrease in the mortality of embryos in relation to other sub-groups and a slight shortening of the eggs’ hatching period in both periods of the flock’s utility. A parallel impulse applied in the 5th stage of egg incubation caused an essential increase in the percentage of dead embryos in both groups, as also a hatching delay. This factor, acting in the 14th stage of incubation of eggs originating from the egg-laying peak, also worsened all analysed hatching indexes. A positive effect of the static magnetic field impulse was observed on the 14th day of hatching in the group of eggs from the final period of the quail flock’s reproductive utility.

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