علوم دامی ایران

علوم دامی ایران

تأثیر پنج روش مختلف همزمانی فحلی بر قطر فولیکول تخمک‌ریزی‌کننده، غلظت پروژسترون پس از تلقیح و درصد گیرایی گاو هلشتاین در تنش حرارتی

نوع مقاله : مقاله پژوهشی

نویسنده
عیسی دیرنده
استادیار، گروه علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران، صندوق پستی 578
10.22059/ijas.2018.254085.653625
چکیده
هدف از این پژوهش، مطالعه تأثیر پنج روش همزمانی فحلی بر قطر فولیکول تخمک­ریزی‌کننده، غلظت پروژسترون در زمان تلقیح و روزهای 5 و 12 پس از تلقیح و درصد گیرایی در شرایط تنش حرارتی در گاو هلشتاین بود. بدین منظور 250 رأس گاو هلشتاین (میانگین تولید روزانه بیشتر از 30 کیلوگرم در روز و نوبت زایش 1/1±6/3) به­طور تصادفی انتخاب و در گروه­های آزمایشی زیر شامل 1- آوسینک (OV)، 2- پری سینک/ آوسینک (PO)، 3- دابل آوسینک (DO)، 4- G7G آوسینک (G7G)، 5- PG7G آوسینک(PG7G) قرار گرفتند. نتایج نشان داد، قطر فولیکول تخمک­ریزی‌کننده در گاوهایی که با روش OV همزمان شدند در مقایسه با دیگر روش­ها به­طور معنی­داری کوچک­تر بود. غلظت پروژسترون در روزهای 5 و 12 پس از تلقیح در گاوهایی که با روش OV همزمان شده بودند در مقایسه با دیگر روش­ها کمتر بود (05/0 >P). گاوهایی که با روش OV همزمان شده بودند در مقایسه با دیگر روش­ها کمترین درصد گیرایی را در روز 32 و 60 پس از تلقیح داشتند (05/0 >P). بین دیگر روش­های همزمانی تفاوتی در درصد گیرایی در روزهای 32 و 60 پس از تلقیح وجود نداشت. به‌طورکلی نتایج این پژوهش نشان داد، استفاده از روش­های بر پایۀ پیش‌همزمانی پیش از آغاز آوسینک می­تواند سبب افزایش باروری در گاوهای هلشتاین در شرایط تنش حرارتی شود.
کلیدواژه‌ها
الایزا
اولتراسونوگرافی
تنش حرارتی
گاو شیری
همزمان سازی فحلی

عنوان مقاله English

Effect of five different heat synchronization protocols on ovulatory follicle diameter, after AI progesterone concentration and conception rate in Holstein cows in heat stress condition

نویسنده English

Essa Dirandeh
Assistant Professor, Department of Animal Science, Sari Agricultural Science and Natural Resources University, Sari, Iran, P. O. Box 578
چکیده English

The objective of this study was to compare the effect of five estrous synchronization protocols on ovulatory follicle diameter, progesterone concentration at AI and days 5 and 12 after AI and conception rate in Holstein cows during heat stress. Holstein cows (n=250) with more than 30 kg/d milk yield were randomly assigned to one of 5 experimental groups, 1) ovsynch (OV); 2) presynch-ovsynch (PO); 3) double ovsynch (DO); 4) G7G-ovsynch (G7G) and 5) PG7G-ovsynch (PG7G).Results showed that ovulatory follicle diameter was smaller in cows synchronized with OV protocol compared to other protocols (P˂0.05). Progesterone concentration at days 5 and 12 post AI was lower in OV protocol compared to other protocols (P˂0.05). Conception rates at days 32 and 62 post AI were lower in OV protocol compared to other protocols (P˂0.05).There was no difference among other synchronization protocols (P <0.05).In conclusion, results of present study showed that using presyhcnronization before initiation of Ovsynch can increase PR/AI of Holstein cows during heat stress.

کلیدواژه‌ها English

Dairy cow
ELISA
heat stress
Ultrasonography
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  • تاریخ دریافت 16 اسفند 1396
  • تاریخ بازنگری 15 اردیبهشت 1397
  • تاریخ پذیرش 18 اردیبهشت 1397