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In recent years, different methods have been employed to prevent pregnancy with ultimate aim of controlling human population. Treatment of some disease by alternative medicine as opposed to the traditional medicine associated with unwanted side effects has been found helpful. Use of FoeniculumVulgare mill has been identified as tranquilizer, anti spasm, elimination of digestive difficulties and reduction of male’s sexual hormones. Therefore, this investigation was mainly conducted to measure the possible effect of this Herbal's extract on male's hormones production.In this research, several rates were divided into four experimental groups and one control group. Experimental groups were injected with 35, 70, 140 and 280 mg/Kg of this herbal extract and the control group received only salin. The results showed that there is no meaningful differences between experimental groups and control group in testis weight, testis volum, epididim and vasadeferens duct weight and no differences was observed between experimental groups and control group in number of spermatogonia and spermatocyte. On the contrary, There is a decreas significantly in number of spermatid and sperm in experimental groups that had received 140 and 280 mg/ Kg doses.