This study was conducted to determine whether the spermatogenesis of t
estes and the serum sex hormone synthesis are influenced by the ligati
on of spermatic arteries. Sixteen adult male dogs were randomly divide
d into four groups. From our preliminary data the spermatogenic arrest
and decrease of testicular volume were noted prominently in dogs afte
r ligation of spermatic arteries. The serum testosterone level decreas
ed and the serum luteinizing hormone level increased significantly in
the same groups, while no significant changes were found in the dogs w
ith preserved spermatic arteries. There were no significant difference
s in the epididymis and serum follicle-stimulating hormone among the f
our groups. This study attempted to establish the critical role of spe
rmatic arteries in testicular function.