We recorded a positive effect of disinfection
of ozone on hatchability from fertilised eggs (91.79%) compared with disinfection of formalin (91.10%) A totally
embryonal mortality of chickens had not record any difference between two methods of disinfection but we recorded
positive effect of ozone on embryonic mortality of chicks to 7 day of incubation and from 15 to 21 day of incubation.