%0 Journal Article %T SEASONAL CHANGES OF SPERMATOGENIC ACTIVITY IN KHOUZESTAN ARABIAN RAMS %J Journal of Veterinary Research %I The University of Tehran Press %Z 2008-2525 %A Erfani Majd, N. %A Dorostqoal, M. %A Goorani Nejad, S. %D 2009 %\ 12/22/2009 %V 64 %N 4 %P - %! SEASONAL CHANGES OF SPERMATOGENIC ACTIVITY IN KHOUZESTAN ARABIAN RAMS %K khuzestan rams. %K seasonal variations %K Seminiferous tubules %K spermatogenic activity %K tstosterone %R %X The reproductive activity is influenced by environmental conditions in most animal species. The aim of the present study was to determine the seasonal changes of seminiferous tubules structure and spermatogenic activity in Khouzestan Arabian rams. For this propose 30 adult rams were reared under closed grazing conditions. Four rams were randomly selected in each season and their live weight, testicular weight and diameters were measured and recorded. Furthermore, their blood sera were collected for measuring testosterone by radioimmunoassay. For microscopic studies, the 5-6fl sections were made and stained with Haematoxylin-Eosin. Results showed that testicular weight and diameter were significantly changed by season (p %U https://jvr.ut.ac.ir/article_20500_24fc367c04ba74837b12eb9771860948.pdf