The rhizome of ginger is a fresh or dried organ of the plant Zingiber of which has been used as a medicine since ancient times. The present study was conducted to examine the effects of ginger on testicular histomorphometry in roosters of broiler chicken flocks. Eighty single-day rooster of broiler chickens belonging to 308 Ross breed was used in the present study. The chickens were divided into two groups with 40 broiler roosters (experimental and control groups). Initially, the rhizome of ginger was powdered; 1 g/kg of ginger powder was added to the ration of the group treated with ginger from the beginning of the breeding season. The blood samples were taken from each chick at 20 weeks of age. The samples were stained with H&E. Data was expressed as mean +/- SD. T-test was used to analyse and compare the difference between the control is also an experimental groups using SPSS 9.0 software. The testosterone level, weight of the testicle, thickness of seminal tube and number of spermatids in the experimental group compared to the control group increased significantly P<0.05. The most important difference between the control and the intervention group treated with ginger was the number and density of spermatids and spermatozoids cells in the lumen area of the seminal tubes. The present study obtained positive results for the efficacy of using ginger in roosters of broiler chick flocks.