بررسی اثرات پروتوکل‌های مختلف پروژسترونی و سطح پایین هورمون eCG بر همزمان‌سازی فحلی در میش‌های عربی

Subject Areas : Camel

ف. ‌خلیلاوی ¹ , م. ممویی ² , ص. طباطبایی ³ , م. چاجی ⁴

1 - Department of Animal Science, Faculty of Animal and Food Science, Ramin Agricultural and Natural Resources University, Mollasani, Ahvaz, Iran
2 - Department of Animal Science, Faculty of Animal and Food Science, Ramin Agricultural and Natural Resources University, Mollasani, Ahvaz, Iran
3 - Department of Animal Science, Faculty of Animal and Food Science, Ramin Agricultural and Natural Resources University, Mollasani, Ahvaz, Iran
4 - Department of Animal Science, Faculty of Animal and Food Science, Ramin Agricultural and Natural Resources University, Mollasani, Ahvaz, Iran

Received: 2016-05-11 Accepted : 2016-09-15 Published : 2016-12-01

Keywords: عملکرد تولیدمثلی, فصل غیر تولیدمثلی, میش‌های عربی, اسفنج MAP,

Abstract :

این آزمایش به منظور ارزیابی عملکرد تولیدمثلی میش‌‌های عربی تیمار شده با اسفنج‌های پروژسترونی کوتاه و بلند‌مدت به همراه سطح پایینی از هورمون eCG، در فصل غیر تولیدمثلی انجام گرفت. بدین منظور 36 رأس میش به سه گروه تقسیم‌بندی شدند: در گروه اول و دوم اسفنج‌های پروژسترونی (60 میلی‌گرم پروژسترون استات، MAP) به ترتیب به مدت 6 و 12 روز به کار گرفته شدند، در حالیکه گروه سوم (بدون هیچ تیمار هورمونی) به عنوان گروه کنترل در نظر گرفته شد. دو گروه ابتدایی پس از حذف اسفنج پروژسترونی، 300 واحد هورمون eCG به صورت تزریق عضلانی دریافت کردند. پارامترهایی مانند نرخ پاسخ فحلی، زمان شروع فحلی، طول مدت فحلی، آبستنی، بره‌زایی و میزان تزایدگله مورد ارزیابی قرار گرفتند. نمونه‌های خون در یک روز قبل از قرارگیری اسفنج، دو روز پس از قرار دادن اسفنج و در روز فحلی گرفته شد. اختلاف آماری معنی‌داری در میان گروه اول و دوم با گروه کنترل بر اساس سطوح استروژن و پروژسترون وجود داشت. اختلاف آماری معنی‌داری در نرخ پاسخ فحلی، زمان شروع فحلی، طول مدت فحلی، آبستنی، بره‌زایی و نرخ تزاید گله در میان گروه اول و دوم وجود نداشت (05/0<P). هرچند این اختلافات زمانی که این دو گروه با گروه کنترل مقایسه گردیدند، معنی‌دار بود. در گروه اول، طول مدت فحلی به طور معنی‌داری از گروه دوم بالاتر بود (05/0>P). به‌‌‌نظر می‌رسدکه در میش‌های عربی تیمار اسفنج کوتاه‌مدت (6 روزه) دارای عملکرد بهتری در مقایسه با تیمار اسفنج بلندمدت (12 روزه) بوده است.

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