بررسی اثر عوامل تنش‌زای اعمال‌شده بر روی میش‌های آبستن نژاد زندی و خصوصیات فیزیکی بره های تازه متولد شده

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه علوم دامی، واحد کرج، دانشگاه آزاد اسلامی، کرج، ایران

10.22034/AEJ.2021.311862.2669

چکیده

تحقیق حاضر به منظور اثر عوامل تنش‌زا بر میش‌ها در طول آبستنی و خصوصیات فیزیکی بره های تازه متولد شده مورد بررسی قرار گرفت. جهت انجام آزمایش 144 عدد میش‌ نژاد زندی که جنین دوقلو داشتند، به 6 تیمار و 6 تکرار (هر تکرار حاوی 4 میش) که در اواسط آبستنی بودند تقسیم شدند. تیمارهای آزمایشی شامل تیمار 1. شاهد، 2. تزریق کورتیزول در 10 بار، 3. جداسازی در 2 موقع (2 بار جداسازی)، 4. جداسازی در 10 موقع (10 بار جداسازی)، 5. پشم‌چینی شبیه‌سازی‌شده در 10 موقع و  6. پشم‌چینی در اواسط آبستنی، بودند. نتایج نشان داد که میش های تیمار پشم چینی در طی شیردهی نسبت به میش‌های گروه 2 بار جداسازی، 10 بار جداسازی و پشم‌چینی شبیه‌سازی‌شده افزایش وزن معنی داری داشتند (P<0/05). میش‌های پشم‌چینی شده شرایط بدنی بزرگ تری در مقایسه با میش‌های گروه پشم‌چینی شبیه‌سازی‌شده و کورتیزول داشتند (P<0/05). بره‌های متولدشده در گروه شاهد و پشم‌چینی شده طول بدن بلندتری در مقایسه با بره‌های باقی گروه ها داشتند (P<0/05). مقدار کورتیزول در میش‌هایی که کورتیزول دریافت کرده بودند و هم چنین پشم ­چینی شده بودند، افزایش معنی داری با شاهد داشتند (P<0/05). بره‌های به دنیا آمده از میش‌های که پشم‌چینی شده بودند وزن زنده بالاتری داشتند (P<0/05). به طور کل نتایج نشان داد که اگرچه تنش ها در طول ابستنی موجب افزایش غلظت گلوکوکورتیکوئیدها می­ گردد اما مقدار غلظت آن ها با پشم چینی در دوران آبستنی به گونه ­ای بود که سبب کاهش خصوصیات وزنی میش ­ها و بره ها نگردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the effect of stress factors on pregnant Zandi ewes and physical characteristics of newborn lambs

نویسندگان [English]

  • Mohammad Kalhor
  • Nima Eila
  • Abolfazl Zarei
  • Aalireza Noshary
Department of Animal Science, Karaj Branch, Islamic Azad University, Karaj, Iran
چکیده [English]

The present study was conducted to investigate the effect of stressors on ewes during pregnancy and the physical characteristics of newborn lambs. To perform the experiment, 144 Zandi ewes with twin embryos were divided into 6 treatments and 6 replications (each replication containing 4 ewes) that were mid-pregnant. Experimental treatments include 1. Control, 2. Injection of cortisol in 10 times, 3. Isolation in 2 times (2 times isolation), 4. Isolation in 10 times (10 times isolation), 5. Simulated wool cut in 10 times and 6. Wool cut in mid-pregnancy. The results showed that the ewes treated with cut wool during lactation had a significant increase in weight compared to the ewes of the group 2 times isolated, 10 times isolated and the simulated cut wool (P <0.05). Sheared wool ewes had greater body condition compared to ewes in the simulated wool cut and cortisol group (P <0.05). Lambs born in the control and wool cut groups had longer body length compared to the lambs in the other groups (P <0.05). The amount of cortisol in ewes that received cortisol and also, wool was cut, there was a significant increase with the control (P <0.05). Lambs born from ewes that had their wool cut had a higher live weight (P <0.05). In general, the results showed that although stresses during pregnancy increase the concentration of glucocorticoids, but their concentration by wool cutting during pregnancy was such that it did not reduce the weight characteristics of ewes and lambs

کلیدواژه‌ها [English]

  • Zandi Ewes
  • Lambs
  • cortisol
  • Live weight
  • Physical characteristics
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    2. سیدشریفی، ر.؛ طاهرسولا، ه.؛ هدایت ­ایوریق، ن.؛ سیف دواتی، ج.؛ عبدی ­بنمار، ح. و بوستان، آ.، 1397. تحلیل اقتصادی گوسفند مغانی در طول چرخه تولید سالانه در دو سیستم مختلف پرورشی. فصلنامه محیط زیست جانوری. سال 10، شماره 4، صفحات 99 تا 106.

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