Effect of Oxytocin on uterine involution, cervicaldilation and resumption of ovarian activity postlambing in Ossimi ewes

Journal of Livestock Science

article

M.Y. Mohamed¹  A.A. Abd El-Hakeam²  O.M. Abd El-Salam¹ 

[1] Animal Production Research Institute ,(APRI), Agricultural Research center;Department of Animal Production, Faculty of Agriculture, Minia University

关键词: Cervix;    ovary;    uterine;    Oxytocin;    sheep;   

DOI  :  10.33259/JLivestSci.2021.161-169

学科分类：农业科学（综合）

来源: Journal of Livestock Science

【 摘 要 】

Anatomy and cervix structure in the ewes commonly inhibit non-surgical artificial insemination (AI) andembryo transfer (ET), thus limiting their commercial use in sheep. This research was carried out to determinewhether oxytocin (OT) dilates the cervix and promotes uterine activity. Animals (n=24) were assigned to threegroups (8 each). The first and second groups (G1 & G2) were intramuscularly (IM) and intravenously (IV)weekly injected with 20 IU of OT, respectively. However, the third group was IM injected with saline (control,G3). Results showed that the restoration of vaginal length had a similar interval in all groups. The deepestpenetration distance of the cervix was greater in OT-treated than in control ewes. OT injection positivelyaffected (P< 0.001) the frequency of successful uterine entries. There were significant (P< 0.05) increases infollicles number and diameter in OT-treated groups compared to control. Also, the results indicated earlieruterine horn symmetry in OT-treated groups than in control, which may suggest beneficial effects of OT onearlier uterine involution through 1st month post-lambing. Treated ewes showed higher estrus rate (100 & 100 vs75 %) and conception rate (87.5 & 87.5 vs 62.50 %), lower No. of service per conception (1.38 & 1.25 vs 1.63serv.), and shorter at 1st estrus post-lambing (57.63 & 55.75 vs 71.38 d) than in control. Milk yield was notsignificantly affected by treatment. Method of OT-injection (IV or IM) had no significant effect on mostreproductive parameters, although the IV method was more potent and effective than IM. In conclusion, postlambing OT injection would lead to earlier uterine innovation, activate ovarian functions, and dilate andpenetrate the cervical canal and subsequently improve the reproductive traits of Ossimi ewes. Also, OT injectioncould be useful to improve the procedures of AI and ET in sheep.

【 授权许可】

Unknown