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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

استادیار، گروه علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران، صندوق پستی 578

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


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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