Aromatase, a member of the cytochrome P450 superfamily (encoded by CYP19), is the enzyme responsible for the aromatization of androgens into estrogens which is the last step of estrogen biosynthesis. It plays an important role in reproduction and sexual development. The aromatase expression in many tissues and organs of different species is shown in the last two decades' investigation. This study was conducted to determine the relative seasonal expression of aromatase mRNA in testis, epididymis, vas deferens, prostate and seminal vesicle of a male goat. The aromatase expression of 16 male goat reproductive organs, slaughtered in the different seasons (n = 4 each season), were determined by quantitative real-time polymerase chain reaction (qRT-PCR). Results showed that during the autumn, aromatase mRNA expression of the testis was found to be significantly higher (p < .05) as compared to the spring and summer seasons. Higher aromatase mRNA expression was also found in the epididymis and seminal vesicle organs during the autumn and summer seasons. Interestingly, prostate and vas deferens aromatase mRNA expression during the summer was higher than in other seasons. The aromatase mRNA level analysis revealed that aromatase is expressed in all the examined reproductive organs in which a strong expression signal was detected in the testis and epididymis tissues. This study shows the expression of the aromatase in the goat reproductive organs in the breeding season which resembles other mammals with continuous breeding.
