نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه علوم دامی، دانشکده کشاورزی، دانشگاه لرستان، خرم آباد، ایران.
2 معاونت 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
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