It can be concluding that anise seed (0.5 g/kg diet) supplementation improve body weight gain, FCR, performance index and relative growth rate of broiler chicken. Moreover, anise supplementation (0.5 g/kg) non significantly increased thymus gland weight relative to the body weight and had no effect on both bursa and spleen index, while the higher level (group, 7) had negative effect on spleen, bursa and thymus gland weight percent, that indicate anise at 0.5 g/kg supplementation had stimulatory immune effect, my provide hepatoprotective effect and improve the economical efficiency of production while, the higher level may be had negative effect.
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