effect of hatchery probiotic administration methods on performance, and immune response in broiler chickens

probiotics are beneficial microorganisms which will be considered as alternatives to antibiotic growth promoters.the aim of the present study was to investigate the effect of probiotic administration in hatchery on performance, blood parameters and immune response of broilers. three hundereds 1-d-old male chicks (ross 308) were assigned to five experimental groups of three replications. birds of control group did not receive any probiotic. birds of the remaining 4 experimental groups receved probiotics in hatchery via following routes of administration including: in ovo injection, oral, spray and cloacal,respectively. administration methods of probiotic in hatchery significantly influenced body weight gain in finisher period(p