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تأثیر تزریق هورمون PMSG و GnRH پس از تلقیح مصنوعی بر عملکرد تولیدمثلی میشهای لری در فصل غیرتولیدمثلی | ||
| علوم دامی | ||
| دوره 39، شماره 151، شهریور 1405، صفحه 49-58 اصل مقاله (1.57 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/asj.2025.368960.2477 | ||
| نویسندگان | ||
| سید مجتبی موسوی* 1؛ حسن بهرام پور2 | ||
| 1گروه علوم دامی، دانشکده کشاورزی، دانشگاه لرستان، خرم آباد، ایران. | ||
| 2معاونت امور دام سازمان جهاد کشاورزی لرستان، خرم آباد، ایران. | ||
| چکیده | ||
| غلظت پایین پروژسترون پس از جفتگیری باعث تولید رویانهای کوچک و نارس میشود و نرخ مرگومیر رویان را افزایش میدهد. هدف از این آزمایش، بررسی تأثیر تزریق هورمون GnRH و هورمون PMSG پس از تلقیح بر عملکرد تولیدمثلی میشها در فصل غیرتولیدمثلی بود. به این منظور، 75 رأس میش نژاد لری با استفاده از برنامه 12 روزه اسفنج گذاری، همزمانسازی فحلی شدند. در روز چهارم پس از تلقیح، میشها بهطور تصادفی در سه گروه آزمایشی قرار گرفتند. گروههای اول، دوم و شاهد به ترتیب پنج میلیلیتر هورمون GnRH ، 300 واحد بینالمللی هورمون PMSG و یک میلیلیتر محلول سالین بهصورت عضلانی دریافت کردند. در روز 14 پس از تلقیح، غلظت هورمون پروژسترون اندازهگیری شد و در روز 40 پس از تلقیح، وضعیت آبستنی میشها موردبررسی قرار گرفت. در پایان، فرآسنجههای تولیدمثلی ثبت گردید و تحلیل دادههای با استفاده از نرمافزار SAS انجام شد. نتایج نشان داد که نرخ باروری و نرخ تزاید گله در میشهای تحت درمان با هورمون GnRH (به ترتیب 68 درصد و 76/0) بهطور معنیداری (05/0P<) بیشتر از میشهای تحت درمان با هورمون PMSG (به ترتیب 36 درصد و 48/0) و میشهای گروه شاهد (به ترتیب 32 درصد و 32/0) بود. علاوه بر این، تزریق هورمونهای GnRH و PMSG در روز 14 پس از تلقیح، غلظت هورمون پروژسترون را در مقایسه با گروه شاهد، بهطور معنیداری افزایش داد. بهطورکلی، نتایج این تحقیق نشان داد که تزریق GnRH، بهبود قابل توجهی در نرخ برهزایی و تزاید گله در میشهای نژاد لری در فصل غیر تولیدمثلی ایجاد میکند. | ||
| کلیدواژهها | ||
| GnRH؛ PMSG؛ فصل غیر تولیدمثلی؛ گوسفند لری؛ همزمانسازی فحلی | ||
| عنوان مقاله [English] | ||
| The impact of GnRH and PMSG administration post-insemination on reproductive performance of Lori ewes during the non-breeding season | ||
| نویسندگان [English] | ||
| Seyyed Mojtaba Mousavi1؛ Hasan Bahrampour2 | ||
| 1Department of Animal Science, Faculty of Agriculture, Lorestan University, Khorramabad, Iran. | ||
| 22- Animal production sector, Agricultural Organization, Khoramabad | ||
| چکیده [English] | ||
| Reduced progesterone (P4) concentrations following mating have been associated with the development of smaller, underdeveloped embryos, leading to increased rates of embryonic mortality. The primary objective of this study was to elucidate the effects of administration of Pregnant Mare Serum Gonadotropin (PMSG) or Gonadotropin-Releasing Hormone (GnRH) post-insemination on the reproductive performance of Lori ewes during the anestrus season. 75 Lori ewes were randomly assigned to three treatment groups in a completely randomized design (CRD) experiment. Initially, all ewes were subjected to estrous synchronization using intravaginal sponges. The ewes were randomly allocated to one of three treatment groups post-insemination on the fourth day. The first group received an intramuscular injection of 5 mL of GnRH, the second group was administered 300 IU of PMSG, and the control group received 1 mL of saline solution. Progesterone levels were measured on the 14th day post-insemination, and pregnancy status was confirmed by ultrasonography on the 40th day. Finally, reproductive parameters were recorded and data analysis was performed using SAS software. The results indicated that GnRH-treated ewes exhibited significantly higher lambing rates (68.00%) and fecundity rates (0.76%) in comparison to their PMSG-treated counterparts (36.00% and 0.48%, respectively) and the control group (32.00% and 0.32%, respectively). Furthermore, both GnRH and PMSG treatments resulted in significantly higher P4 levels on the 14th day post-insemination compared to the control group. These findings suggest that administering GnRH on the fourth day post-insemination can substantially enhance lambing and fecundity rates in Lori ewes during the non-breeding season. | ||
| کلیدواژهها [English] | ||
| Anestrous, Estrous synchronization, GnRH, Lori ewe, PMSG | ||
| مراجع | ||
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