EN
Studies were conducted in a cow-shed for 309 cows by means of a computerized magnetometer (Geo-Magnetometer BPM 2001 + Geo-Graph BPM 3009 prod. Bio-Physil Mersmann). Some geomagnetic disturbances were found to occur in some stalls. Comparative studies concerned 3 „geopathic” stalls and 3 free from any disturbances. It was found that the cows staying for several months in „geopathic” stalls showed noticeable changes in hair color, which disappeared after transferring the cows to the stalls free from disturbances. Whereas, in healthy cows moved to „geopathic” stalls, similar changes started to appear. Geopathic stalls can be responsible for health disorders in animals.