New Technique for Activating Reproductive System during Non-Breeding Season in Ghezel Ewes
محورهای موضوعی : Camelب. قاسمی-پناهی 1 , س.ع. رافت 2 , م. ابراهیمی 3 , م.ح. اکبرزاده 4 , ر. حاجیعلیزاده ولیلو 5
1 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
2 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
3 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
4 - Department of Veterinary Medicine, Tabriz Branch, Islamic Azad University, Tabriz, Iran
5 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
کلید واژه: Reproduction, non-breeding season, CIDR, eCG, flushing diet, Ghezel ewes,
چکیده مقاله :
Ghezel sheep is one of the main breeds in the north-west of Iran which is reared for meat, milk and wool production. Improving reproduction of this breed will have a significant impact on the economic development of local farmers. Therefore, in the present study the effect of simultaneous use of estrus synchronization(controlled internal drug releasing(CIDR) and equine chorionic gonadotropin(eCG)) and flushing diet on reproduction during non-breeding season in Ghezel ewes was determined. A total of 114 three-year-old Ghezel ewes were equally divided into three treatment groups. Group 1 was synchronizing with CIDR and eCG and was flushed for 40 days. Group 2 was flushed only for 40 days and group 3, the control did not receive any treatment at all. Rams also received a flushing diet concurrent with ewes. CIDR application was performed for 12 days, following CIDR withdrawal, each of the group 1 ewes received an intramuscularly injection with 400 IU eCG. Thereafter, all ewes were introduced to the rams. Pregnancy was determined by ultrasound at 50 days after introduction to the rams. Lambing rate in group 1 was 276.32% and the pregnancy rate was 100%. This result was significantly different from group 2 and 3. Although a minor improvement in pregnancy percentage was observed in group 2 in comparison with control group, the overall results suggested that flushing alone was not effective in activating the reproductive system in non-breeding season. This study showed that estrus synchronization using CIDR and eCG accompanied with flushing diet was a suitable technique to improve lamb production during non-breeding season in Ghezel ewes.
گوسفند قزل یکی از نژادهای اصلی در شمال غرب ایران است که به منظور تولید گوشت، شیر و پشم پرورش داده می‌شود. بهبود تولیدمثل این نژاد تأثیر معنی‌داری بر روی رشد اقتصادی کشاورزان منطقه خواهد گذاشت. بنابراین در پژوهش حاضر تأثیر استفاده همزمان از همزمان‌سازی فحلی (سیدر و eCG) و جیره فلاشینگ بر تولیدمثل خارج از فصل در میشهای قزل تعیین شد. تعداد 114 رأس میش قزل 3 ساله به طور مساوی به سه گروه آزمایشی تقسیم شدند. گروه 1 به وسیله سیدر و eCG همزمان‌سازی شدند و 40 روز جیره فلاشینگ دریافت کردند. گروه 2 برای 40 روز جیره فلاشینگ دریافت کردند و گروه 3 (شاهد) هیچ تیماری را دریافت نکردند. قوچ‌ها نیز به صورت همزمان با میش‌ها جیره فلاشینگ دریافت کردند. سیدرگذاری به مدت 12 روز انجام شد، به دنبال برداشتن سیدرها هر یک از میشهای گروه 1 مقدار 400 واحد eCG به صورت تزریق درون ماهیچه‌ای دریافت کردند. سپس، قوچ‌ها وارد گله میش‌ها شدند. پنجاه روز بعد از قوچ اندازی از اولتراسوند برای تعیین آبستنی استفاده شد. نسبت بره‌زایی در گروه 1 مقدار 32/276 درصد و نسبت آبستنی 100 درصد بود. این نتیجه به طور معنی‌داری متفاوت با گروه 2 و 3 بود. اگر چه بهبود اندکی در درصد آبستنی در گروه 2 نسبت به گروه کنترل مشاهده شد، نتایج کلی پیشنهاد می‌کنند که فلاشینگ به تنهایی در فعال‌کردن سیستم تولیدمثلی در خارج از فصل تولیدمثلی مؤثر نیست. این پژوهش نشان داد که همزمان‌سازی با استفاده از سیدر و eCG به همراه جیره فلاشینگ یک روش مناسب برای بهبود تولید بره در خارج از فصل تولیدمثلی در میشهای قزل است.
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