The present work aimed to study the effect of feeding broiler chicks on diets containing different levels of curcumin, anise ground seeds and their interactions as natural feed additive on immune response and nitrogen, calcium and phosphorus retention efficiency percentage and economical evaluation. A total of 297, one-day-old Ross308 broiler chickens were randomly allocated to nine experimental treatments with three replications of eleven birds each (3×3). Three curcumin levels (0, 50 and 100 mg/kg) and 3 anise ground seeds levels (0, 0.50 and 1%) added to basal diet. The results showed that there was a significant (P<0.05) improvement in IgM for birds fed on diets containing anise seeds (0.5 or 1% in diet). There was significant (P<0.05) effect due to interactions of curcumin and anise levels on IgG at age 21 day and IgA at age 42 day. There was no significant effect of curcumin, anise seed alone and interactions on the bursa percentage and spleen percentage at the age of 42 days. The results also showed a decrease in nitrogen retention efficiency percentage in birds fed diets containing curcumin at age 43-45 day. The rate of calcium retention efficiency percentage decreased in birds fed diets containing anise seeds at age of 43-45 days. It was recommended that curcumin as medical herbs should be add at level of 50 mg/kg diet or 100 mg/kg curcumin plus 0.5% anise ground seeds to achieve higher immunity of broiler chicken (Ross 308).

The present study was designed to investigate the effect of curcumin and anise ground seeds levels as well as their interactions on growth performance and some carcass traits of Ross308 broiler chickens. Two hundred and ninety seven birds were randomly assigned in (3×3) factorial design experiment. Three curcumin levels (0 ,50,100 mg/kg in diet) and three anise ground seeds levels (0 ,0.50% and 1% in diet) were used in nine treatments of 33 birds each (three replicates of 11 birds each).The body weight and feed intake were measured weekly and consequently, weight gain and feed conversion ratio were calculated. At the end of the experiment, three birds from each group were sacrificed to evaluate carcass parts. The results showed that chickens fed curcumin at level of 100 mg/kg diet achieved significantly higher body weight at 14 days of age and body weight gain during the period of 7-14 days than control. The addition of anise ground seeds at level of 1% achieved higher feed intake than control. The addition of 50 mg/kg diet of curcumin and 1% anise ground seeds achieved better feed consumption during the period from 14-21 and 21-28 days of age than other interactions. No significant (P>0.05) effects on feed conversion ratio due to curcumin, anise ground seeds and their interactions were obtained. There were significant (P<0.05) effect due to curcumin levels on hart and left femur. Also, There were significant (P<0.05) effect due to anise seeds on shank , tibia left and neck. No significant (P>0.05) effect due to either curcumin or anise ground seeds or their interactions were observed on carcass and dressed percentages.It was recommended that curcumin may be added at level of 100 or 50 mg/kg diet, or 50 mg/kg of curcumin plus 1% anise ground seeds to achieve higher growth performance and carcass criteria of broiler chicken (Ross 308).