Hasani Nasrin, Ebrahimi Marziyeh, Ghasemi-Panahi Babak, HosseinKhani Ali
Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, 5166616471, Iran.
Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, 5166616471, Iran.
Theriogenology. 2018 Dec;122:9-13. doi: 10.1016/j.theriogenology.2018.07.005. Epub 2018 Aug 29.
Although estrus synchronization considered valuable management tools for improving reproductive performance of ewes, their high expenses and complicated usage prevent sheep farmers to apply these techniques. Therefore, the present study was designed to compare three protocols of estrus synchronization on reproductive performance of Ghezel ewes. For this reason, 27 Ghezel ewes were assigned to three estrus synchronization treatment groups based on a completely randomized design included: progestogen sponge for 12 days + 500 IU eCG at the time of sponge withdrawal (P4eCG group, expensive synchronization), two doses of 75 μg cloprostenol with 12 days interval (CLO group, economical synchronization), and CLO +500 IU eCG at day 12 (CLOeCG group, moderately priced synchronization). Four consecutive blood samples were also collected during the experiment to evaluate progesterone concentrations. The results of the present experiment showed that pregnancy and lambing rates of the first estrus as well as blood progesterone concentration were not affected by the treatments (P > 0.05), though total pregnancy and lambing rates were higher in both P4eCG and CLOeCG groups (P < 0.01). Accordingly, both P4eCG and CLOeCG protocols successfully improved reproductive traits of ewes, though CLOeCG protocol is an advisable technique for sheep farmers through its moderate price, simple application, and high reproductive performance.
尽管发情同步化被认为是提高母羊繁殖性能的重要管理工具，但其高昂的成本和复杂的使用方法阻碍了养羊户应用这些技术。因此，本研究旨在比较三种发情同步化方案对盖泽尔母羊繁殖性能的影响。为此，根据完全随机设计，将27只盖泽尔母羊分为三个发情同步化处理组，包括：使用孕酮海绵12天 + 在取出海绵时注射500 IU eCG（P4eCG组，昂贵的同步化方法）、间隔12天注射两剂75 μg氯前列醇（CLO组，经济的同步化方法）以及在第12天注射CLO + 500 IU eCG（CLOeCG组，价格适中的同步化方法）。在实验过程中还连续采集了四份血样以评估孕酮浓度。本实验结果表明，首次发情的妊娠率和产羔率以及血孕酮浓度不受处理的影响（P > 0.05），尽管P4eCG组和CLOeCG组的总妊娠率和产羔率更高（P < 0.01）。因此，P4eCG和CLOeCG方案均成功改善了母羊的繁殖性状，不过CLOeCG方案因其价格适中、应用简单且繁殖性能高，对养羊户来说是一种可取的技术。
