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Cervical dilation and improvement of reproductive performance in fat-tailed ewes via cervical dilator treatments
Authors: Reza Masoudi, Ahmad Zare Shahneh, Armin Towhidi, Hamid Kohram, Abbas Akbarisharif, Mohsen Sharafi, Mahdi Zhandi, MAMM Shahab-El-Deen
Number of views: 474
Objective: To determine the effect of different cervical dilators on cervical dilation and
reproductive performance of fat-tailed ewes. Methods: In experiment 1 140 ewes were divided
into seven groups with seven different treatments as following: 10 mL normal saline (control
group), 100 IU oxytocin (OT group), 100 μg estradiol and 100 IU oxytocin (E2+OT group),
5 mL relaxin (R group), 2 mL sensiblex (SEN group), 200 μg misoprostol (MIS group) or
200 μg dinoprostone (DIN group). In experiment 2, artificial insemination was applied for
evaluation of reproductive performance in experimental groups. Results: In experiment 1, the
highest cervical dilation was observed in OT (90%) and E2+OT (100%) groups (P<0.05), while
no significant differences was found among DIN, MIS, SEN and R groups (80%, 75%, 70%
and 65%, respectively). In addition, the lowest cervical dilation was observed in control group.
Experiment 2 found no significant differences among control, OT and E2+OT groups. The
highest pregnancy rate, parturition rate and lambing rate were observed in OT groups (60%,
60% and 70%, respectively) and E2+OT groups (65%, 60% and 70%, respectively) compared
to SEN, R, MIS and DIN groups (P<0.05). Conclusions: Oxytocin treatment alone or with
estradiol could be used as a suitable dilator for improving reproductive efficiency during
artificial insemination in fat-tailed ewes.