Increasing indices of hatching eggs is one of the basic problems of eggs hatching in poultry production.   The eggs quality, eggs disinfection and incubation regime are factors that have great  influence on the results of  correctly incubation of eggs. Choosing the method of eggs disinfection  and efficiency depends on it. So far with great success  is used eggs disinfection  with formaldehyde. Practicing  other ways  of eggs disinfection started relatively not long ago and is why there is a need to study their influences. Using magnetic field  for hen egg activation has shown that embryonic development occurs is more  intensive  and  embryo  weight is higher. Also maximal hatching indices were obtained after incubation of activated eggs. After raising the chickens what were obtained from activated eggs had the average of  maintenance  during  the period of growth of 97.7%.