Abstract
The current research aimed to examine the effects of single-dose oxytocin administration on testicular blood flow measurements peak systolic velocity (PSV), end-diastolic velocity (EDV), resistive index (RI) and pulsatility index (PI) and plasma steroid (testosterone and oestradiol-17β) concentrations in rams. In the treated group, eight mature Ossimi rams during the breeding season were injected intravenously (iv)with 20IU oxytocin, while the othereight male rams were administered normal saline (2ml) ivas a control group. Venous blood samples and testicular blood flow in the left and right testes were examined immediately before (0) and 5, 30, 60 and 120min after injections. The control group did not show significant changes in the variables examined (p>.05), except for the EDV (p<.05). In the treated group, the administration of oxytocin led to a significant decrease in RI and PI values starting 5min after oxytocin administration until 60min after its application (p<.05). The plasma concentrations of testosterone and oestradiol-17β raised from 5 to30min after oxytocin injection (p>.05) and then declined significantly until 120min (p<.05). In conclusion, oxytocin is a potent testicular vasodilator affecting the testicular vascular tone and steroid concentrations in rams.
Published Version
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