comparison of broiler performance, blood biochemistry, hematology and immune response when feed diets were supplemented with ginger essential oils or mannan-oligosaccharide

background: nutritional strategies targeting improvement of poultry performance and disease prevention are currently being developed and in this respect the dietary intake of spiced essential oils and pre-biotics in raising broilers is receiving attention. objectives: this study was conducted to compare the effects of diet containing ginger essential oils (geo) and mannan-oligosaccharide (mos) on growth performance,  biochemical and hematological parameters, lymphoid organ weights and antibody response of broilers. methods: a total of 375 day old male broiler chicks were randomly assigned to five treatments (five replicates per treatment). dietary treatments included basal diet as control, geo-supplemented diets with inclusion levels of 50 (geo1), 100 (geo2) or 200 (geo3) mg/kg, and mos supplemented diet with an inclusion level of 2 g/kg. results: the birds fed on mos and geo3 diets exhibited better feed conversion ratio and higher body weight gain from 1 to 42 day of age compared with control birds (p