نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه علوم دامی، دانشکده کشاوری و منابع طبیعی مغان، دانشگان محقق اردبیلی، اردبیل، ایران.

2 دانش آموخته کارشناسی ارشد، گروه علوم دامی، دانشکده کشاوری و منابع طبیعی مغان، دانشگان محقق اردبیلی، اردبیل، ایران.

چکیده

هدف از مطالعه حاضر مقایسه دو روش همزمان‌سازی فحلی در دو شرایط محیطی طبیعی و تنش گرمایی بر عملکرد تولیدمثلی و غلظت هورمون‌های استروژن و پروژسترون پلاسما در گاوهای شیری هلشتاین بود. تعداد 110 رأس گاو هلشتاین با میانگین تولید 28 کیلوگرم شیر و نوبت زایش یک تا چهار به‌طور تصادفی در بین یکی از دو روش همزمانی قرار گرفتند: 1) روش دابل آوسینک (60=DO; n )، که در این گروه گاوها در روز صفر هورمون GnRH، در روز هفتم PGF2α و در روز نهم GnRH دریافت کردند و بعد از هفت روز دیگر روش آوسینک (GnRH-7d- PGF2α-2d-GnRH-16h-AI) روی این گاوها تکرار شد. 2) روش پری‌سینک آوسینک (50=PO; n)، که در این گروه گاوها دو تزریق هورمون PGF2α به فاصله 14 روز دریافت کردند و بعد از 12 روز دیگر برنامه آوسینک انجام شد. هر دو روش در دو فصل تابستان و زمستان انجام شدند. درصد گوساله‌زایی در گاوهایی که در فصل زمستان همزمان شده بودند بیشتر از گاوهای گروه فصل تابستان بود (36/4 در مقابل 18/2 درصد، 0/04 =P). میانگین تعداد تلقیح به ازای آبستنی در گاوهایی که در فصل زمستان همزمان شده بودند نسبت به فصل تابستان کمتر بود (1/46 در مقابل 1/74درصد، 0/02 =P). میانگین غلظت هورمون استروژن و پروژسترون در فصل زمستان بیشتر از فصل تابستان بود (0/05 > P). با توجه به نتایج حاصل، عملکرد تولید مثلی و غلظت هورمون‌های استروژن و پروژسترون در فصل زمستان بالاتر از فصل تابستان است و روش همزمان‌سازی تفاوتی از نظر تاثیر بر عملکرد تولیدمثلی ندارد.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of two protocols of estrus synchronization in summer and winter seasons on fertility and blood parameters of Holstein dairy cows

نویسندگان [English]

  • Vahid Vahedi 1
  • Babak Naderi 2
  • Ciyamak Ghazaie 1
  • Azadeh Boustan 1

1 Department of Animal Science, Moghan College of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

2 Department of Animal Science, Moghan College of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

چکیده [English]

The aim of this study was the comparison of two protocols of estrus synchronization in two natural climates and heat stress condition on reproductive performance and concentration of plasma estrogen and progesterone hormones in Holstein dairy cows. One hundred and ten multiparous Holstein dairy cows (28 kg average daily milk yield and parity one to four calved) were randomly assigned to two protocol
groups: 1) Double-Ovsynch (DO; n=60), the cows received GnRH-7d-PGF2α-2d-GnRH and Ovsynch (GnRH-7d- PGF2α-56h-GnRH-16h- AI) was initiated 7 d later; 2) Presynch-Ovsynch (PO; n=50), the cows received PGF2α-14d-PGF2α and Ovsynch was initiated 12 d later. The both of the protocols were done in two seasons of summer and winter. The calving rate in cows that were synchronized at winter season was greater than cows synchronized in summer (36.4 vs 18.2%; P= 0.04). Mean of the number of insemination to conception was lower in cows that synchronized in winter compared to cows synchronized in summer (1.46 vs 1.74; P= 0.02). Mean of measured estrogen and progesterone hormones concentrations was higher in cows that synchronized in winter compared to summer (P < 0.05). Overall, mean of reproductive traits and hormones concentration is higher in cows that synchronized in winter than in summer and the protocol of estrus synchronization had no effect on reproductive performance.

کلیدواژه‌ها [English]

  • Dairy Cows
  • Double-Ovsynch
  • heat stress
  • Presynch-Ovsynch
  • reproductive performance
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