مقایسه تاثیر تجویز HCG و GnRH پنج روز پس از تلقیح مصنوعی بر میزان آبستنی گاوهای شیری تحت تنش گرمایی خفیف

پژوهش های بالینی و آزمایشگاهی دامپزشکی

دوره 4، شماره 11، تیر 1389، صفحه 1-10   

نوع مقاله: مقاله پژوهشی

چکیده

کارایی تولیدمثلی گاوهای شیری زمانی که در معرض تنش گرمایی قرار می گیرند، کاهش می یابد. هدف از انجام این مطالعه بهبود باروری گاوهای تحت تنش گرمایی با استفاده از داروهای گونادوترپ بود. گاوها پس ازفحل یابی وتلقیح مصنوعی بطور تصادفی در سه گروه قرار داده شدند. گروه شماره 1 (تعداد=44راس) به گاوهای این گروه 5 روز بعد از تلقیح یک دوز(500 میکروگرم) GnRH  به صورت عضلانی تزریق شد. گروه  شماره 2 (تعداد=44راس) به این گاوها در روز 5 بعد از تلقیح 1500 واحد HCG به صورت عضلانی تزریق شد. در فاصله 32 تا 39 روز پس از تلقیح تشخیص آبستنی بوسیله سونوگرافی انجام شد. اختلاف آماری معناداری بین میزان آبستنی گروه های تحت درمان در مقایسه با گروه شاهد مشاهده نشد. میزان آبستنی بین گروههای شماره 1و 2 بر اساس روزهای باز بیشتر از150 روز، 40% و 72% محاسبه گردید که اختلاف مشاهده شده از نظر آماری معنادار است(P<0/05). میزان آبستنی در داخل گروه 1 بر اساس متغیر روزهای باز 40% و 76% می باشد که اختلاف مشاهده شده از نظر آماری معنادار است(P<0/05). همچنین میزان آبستنی در داخل گروه های شاهد و2 بر اساس تعداد تلقیحات قبلی به ترتیب 80% ، 31%، 77% و 39% محاسبه گردید که اختلاف مشاهده شده از نظر آماری معنادار است(P<0/05). با توجه به نتایج این مطالعه استفاده از HCG پس از تلقیح در گاوهای واکل در فصل تابستان توصیه می شود.

کلیدواژه‌ها

تنش گرمایی؛ گاوشیری؛ کاهش باروری؛ GnRH؛ HCG

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