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Objective: This experiment was carried out to determine the effects of supplementation different levels oregano oil (Origanum vulgare) and carob (Ceratonia siliqua l.) powder mixed on growing performance, carcass yield and some internal organs weight in broilers.
Material and Metods: A total of 192 daily broiler mixed gender chicks were used in this experiment. They were divided into one control group and three treatment groups each containing 48 chicks. Each groups was divided into four subgroups each containing 12 chicks. This experiment was conducted 42 days. The basal diet was given to the control group and others three gorups were given with added oregano oil (Origanum vulgare) and carob (Ceratonia siliqua l.) powder mixed (0.5, 1 and 2 g/kg), respectively. Feed and water were given ad-libitum. The metabolizable energy (ME) and crude protein (CP) levels of the diets from 1-14 days of age 3000 kcal/kg and
23 %, 15-28 days of age 3100 kcal/kg and 21 % and 29-42 days of age 3200 kcal/kg and 20 %, respectively.
Results: At the end of the experiment there were no statistically differences in body weight (BW), body weight gain (BWG), feed consumption (FC), feed conversion ratio
(FCR) carcass and internal organs compared with control groups (P >0.05).
Conclusion: In this study, it was concluded that a mixture of oregano oil and carob powder mix can be safely added to diets of broiler at 1 g / kg