تعیین دوز بهینه eCG به منظور بهبود عملکرد تولیدمثلی میش‌های لک‌قشقایی در فصل تولیدمثل

نوع مقاله : فیزیولوژی (جانوری)

نویسندگان

1 گروه علوم دامی، دانشکده کشاورزی، دانشگاه یاسوج، یاسوج، ایران

2 اداره کل امور عشایر استان کهگیلویه و بویراحمد، یاسوج، ایران

چکیده

این پژوهش در یک سامانه پرورش عشایری به ­منظور بررسی تأثیر دوزهای متفاوت eCG بر عملکرد تولیدمثلی میش ‌ها در فصل پاییز انجام شد. در این آزمایش 75 رأس میش لک ‌قشقایی با میانگین وزنی 2/3±54 کیلوگرم از یک گله سالم انتخاب شد. به­ منظور هم ­زمان‏ سازی فحلی، اسفنج‏ های پروژسترونی در داخل واژن همه میش‏ ها وارد شدند و پس از 12 روز خارج گردیدند. یک روز قبل از اسفنج‏ برداری، میش ­ها ‎به ­طور تصادفی به پنچ گروه تقسیم شدند و هورمون eCG در دوز IU300 به گروه 1، در دوز IU400 به گروه 2، در دوز IU500 به گروه 3، در دوز IU600 به گروه 4 به ­صورت درون ‏ماهیچه­ ای تزریق شد. گروه 6 به ­عنوان شاهد درنظر گرفته شد. متغیرهای تولیدمثلی از قبیل شروع فحلی (بر حسب ساعت پس از برداشت اسفنج)، درصد فحلی، نرخ آبستنی، میزان دوقلوزایی، نرخ بره‏زایی و نرخ چندقلوزایی در همه گروه‏ ها مورد سنجش  قرار گرفت. نتایج نشان داد که پس از اسفنج ‏برداری، شروع فحلی در گروه 3 و 4 به ­طور معنی ‌داری نسبت به گروه‌ های شاهد، 1 و 2 زودتر بود (0/05>P). هیچ اختلاف معنی‎ داری بین شش گروه از نظر سایر فراسنجه‏ های تولیدمثلی وجود نداشت (0/05<P). با این­ حال، تعداد بره متولد شده و فکاندیتی و هم­ چنین نرخ دوقلوزایی و پرولیفیکیسی در گروه 4 و به ­ویژه در گروه 3 در مقایسه با سایر گروه ‏ها بالاتر بود. به ­طورکلی نتایج نشان داد که دوز 500 واحد بین‌المللی eCG دارای بیش ­ترین تأثیر در افزایش عملکرد تولیدمثلی در میش ‌های لک قشقایی در فصل پاییز بود.

کلیدواژه‌ها

عنوان مقاله [English]

Determining the optimal dose of eCG to improve the reproductive performance of Lake-Ghashghaei ewes in the breeding season

نویسندگان [English]

  • Javad Habibizad 1
  • Mohsen Towhidi 2
  • Farhad Samadian 1
1 Department of Animal Science, Faculty of Agriculture, Yasouj University, Yasouj, Iran.
2 Nomads Administration of Kohgiloye and Boyerahmad province, Yasouj, Iran
چکیده [English]

This study was conducted at nomadic pastoralist system to evaluate the effect of different doses of eCG on reproductive performance of ewes in the autumn season. Seventy-five Lake Ghashghaei ewes with the mean weight of 54±2.3 kg were chosen from the herd. In order to estrous synchronization, progesterone sponges were inserted into the vagina of all the ewes and after 12 days, inserts were removed. One day before sponge withdrawal, ewes were divided randomly into five groups and at the doses of 300 IU in group 1, 400 IU in group 2, 500 IU in group 3 and 600 IU in group 4, eCG hormone were injected intramuscularly. The group 6 serves as control. The reproductive variables such as onset of estrus (hour), estrous response, pregnancy rate, twining rate, fecundity and prolificacy rate were measured in all groups. The results showed that after sponge withdrawals, the onset of estrus in the groups 3 and 4 were significantly earlier than control and groups 1 and 2 (P<0.05). There were no significant differences between six groups with regard to the other reproductive parameters. However, the total number of lambs born and fecundity, as well as twining percentage and prolificacy were higher in group 4 and especially in the group 5 compared to other groups (P≥0.05). In may be concluded that eCG injection at the dose of 500 IU had the greatest effect on increasing reproductive performance of Lake-Ghashghaei ewes on the breading season.

کلیدواژه‌ها [English]

  • Equine Chorionic Gonadotropin
  • Lake-Ghashghaei ewes
  • Reproductive performance
  • Twining rate

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فصلنامه محیط زیست جانوری
دوره 12، شماره 3
مهر 1399
صفحه 33-40

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