The effects of magnetic field of the intensity 0,07 T on embryonic mortality of chicken were studied. Embryonic mortality in eggs exposed to the magnetic field during their incubation was higher (14,28 ± 3,14 %; 18,57 ± 4,03 % resp. 18,95 ± 3,77 %). In comparison with the control group (1,57 ± 0,97 %) all results were significantly different (p < 0,001). The negative effect of the magnetic field manifested also by the lower weight of the hatched chickens (33,58 ± 2,07 g; 33,09 ± 3,73 g resp. 31,17 ± 4,21 g) when compared with the control group (40,80 ± 5,12 g) (p < 0,05).

        Key words: magnetic field, embryonic mortality, body weight