جستجوی مقالات مرتبط با کلیدواژه "اکسی توسین" در نشریات گروه "علوم دام"

The aim of this study was to evaluate the effect of estradiol (E2)، oxytocin (OT)، relaxin (relaximol) injection and prostaglandin E1 (misoprostol) suppository on the cervix dilation، time of cervical dilation persistency and pregnancy rate of Zandi ewes using artificial insemination. Eighty 3-4 years old and 55±2. 5 kg weight ewes were used for this study. In experiment 1، the ewes were assigned to four equally groups. The groups were received 100 µl E2، 100 IU of OT، 5 ml relaximol and 200 µg misoprostol، respectively. Then، cervical dilation and time of cervical dilation persistency were examined at four times. E2 had no effect on cervical dilation and time of cervical dilation persistency (P>0. 05). Using of OT، relaximol and misoprostol lead to cervical dilation (P<0. 05). In experiment 2، the estrous synchronization was accomplished using CIDR insertion for 12 days. At the time of CIDR removal، 500 IU of eCG injected in to the ewes and then assigned to four equally groups. The control group received no cervical dilator treatment. Other three groups received the same treatment as the first experiment. According to the best time of cervical dilation in experiment 1، ewes were inseminated transcervically in the times of 20 and 40 min and 5 hours after treating، respectively، at 54 hours after eCG injection. Fifty days after insemination، pregnancy rate were recognized via ultrasonography diagnosis. Pregnancy rate in OT group was higher (P<0. 05) than misoprostol and relaximol groups (60% vs 25 and 10%، respectively). However، there were no significant differences (P>0. 05) between oxytocin and control group (60% vs 50%) in pregnancy rate. In conclusion، injection of oxytocin dilate the cervical canal and improved pregnancy rate in Zandi ewes، therefore this could be used as an instrument for improving pregnancy rate during artificial insemination.

The aim followed in the present study was to evaluate the effect of Estradiol (E2) injection and injection (either intramuscular (i. m) or intravenous (i. v)) of various doses of OxyTocin (OT) on cervix dilation and on conception rate in Zandi ewes during late breeding season. Sixty three ewes were randomly selected. In experiment 1، the ewes received 100 µl E2 and 12h later were divided and assigned into 7 groups. Control group (n=9) did not receive OT. The six remaning groups were divided into 2 parts using i. m or i. v injection and in each group in every part، ewes (n=9) were treated 60، 80 or 100 IU of OT. Cervix penetration was measured before and after (10 min and 12h) E2 injection (before OT injection) and 15 min after OT injection by use of a scaled pipette of artificial insemination. Experiment 2 was the same as experiment 1 but here the ewes did not receive E2 and were just tested for the effect of OT on cervix dilation. In experiment 3، the estrous synchronization was done using CIDR insertion for 12 days. At the time of CIDR removal، 500 IU of eCG was injected i. m to the ewes.

The aim of this research was to investigate the effects average of injection of Oxytocin and Equine Chorionic Gonadotropin hormones on semen characteristics of Zel ram during nonbreeding season. This experiment was carried out in the form of multiple Latin Square from late spring to early summer. Six rams with an weight of 45 kg were used for this research. Levels of 0, 5, 10 of Oxytocin hormone and levels of 0, 400 and 600 international unit (IU) of Equine Chorionic Gonadotropin hormone were injectedintramuscularly. Results showed that injection of different levels of Oxytocin had not significant effect on scrotal circumference, sperm motility and abnormal sperm percentages (P>0.05). There was a significant differences between the levels of 5 and 10 IU of Oxytocin in comparison with control treatment for semen volume, mass motility,live sperm percentage, spermatozoa concentration per ml of semen and per ejaculation(P<0.05). The injection of different levels of Equine Chorionic Gonadotropin did notaffect semen volume (P>0.05), but there was a significant difference between controltreatment and levels of 400 and 600 IU of hormone for other semen characteristics(P<0.05). In conclusion, the intramuscular injection of 10 IU of Oxytocin and 600 IU ofEquine Chorionic Gonadotropin hormones are recommended to improve Zel ram semencharacteristics during nonbreeding season.

One of the serious complications of labor induction in cows and heifers reducing the reproductive efficiency of these animals (1, 8, and 10) is retained placenta after delivery. This study was conducted in a dairy cattle industry located in West Azerbaijan. The experiment was conducted on 100 pregnant heifers which their induction of labor was being carried out by prostaglandin and dexamethasone. Obtaining the exact results in this study, 40 out of 100 heifers were selected and divided into two groups. Each group containing 20 heifers were injected by prostaglandin and oxytocin intramuscularly to experience the disposal of fetal membranes. The dose for each shot of prostaglandin and oxytocin was respectively 750 μg / ml ((3 cc), and 100 IU (10cc). It is also important to note that each group was divided into two subgroups of 10 cows. This sub-classification was done based on the sex of newborn calves. Using Nonparametric Correlations statistical methods, collected data were calculated and analyzed. The results showed that the time for disposal of fetal membranes was significantly reduced in postpartum heifers that received prostaglandin in comparison with the heifers that were injected by oxytocin. Also, the time for placenta disposal has decreased in heifers that have given birth to male calves and received postpartum prostaglandin rather than heifers that have given birth to female calves and received oxytocin injection after delivery.