تأثیرات تزریق داخل تخم‏مرغی هورمون تیروکسین و استفاده از مکمل آرژنین در جیره غذایی بر عملکرد و مقاومت جوجه‏ های گوشتی به سرما

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری تغذیۀ طیور، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه زنجان، زنجان

2 دانشیار، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه زنجان، زنجان

3 استادیار، بخش تغذیه و فیزیولوژی، موسسه تحقیقات علوم دامی کشور، کرج

4 استادیار، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه آزاد اسلامی واحد ورامین، ورامین

5 دانشیار، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه شیراز، شیراز

چکیده

تأثیر تزریق داخل تخم‏مرغی هورمون تیروکسین و استفاده از مکمل آرژنین در جیرۀ غذایی بر عملکرد و مقاومت جوجه‏های گوشتی به سرما، در دو آزمایش بررسی شد. در آزمایش اول، 2400 عدد تخم‏مرغ بارور آرین به‌طور تصادفی بین چهار گروه آزمایشی، کنترل مثبت (فرو بردن سوزن به داخل تخم‏مرغ)، کنترل منفی (عدم تزریق)، تزریق آب مقطر، و تزریق هورمون تیروکسین تقسیم شد. در آزمایش دوم پس از خروج جوجه‏ها از تخم، 240 قطعه جوجۀ نر گوشتی از تیمارهای کنترل مثبت و تزریق هورمون تیروکسین، انتخاب و در قالب طرح پایۀ کاملاً تصادفی و به روش فاکتوریل 2×2 با دو سطح تزریق (عدم تزریق و تزریق 65 نانوگرم هورمون تیروکسین) و دو جیره (بدون مکمل آرژنین و افزودن 5 کیلوگرم آرژنین در تن خوراک) مطالعه شدند. برای القای آسیت، تمام جوجه‏ها از 14روزگی تا پایان دورۀ پرورش در دمای 15 درجۀ سانتی‏گراد قرار گرفتند. تزریق داخل تخم‏مرغی هورمون تیروکسین، تعداد جوجۀ درجۀ دو و وزن کیسۀ زرده را در مقایسه با گروه شاهد، به‌طور معنی‌دار کاهش داد (05/0P<). تزریق هورمون تیروکسین و استفاده از آرژنین در جیرۀ غذایی درصد تلفات ناشی از آسیت، درصد هماتوکریت، و تعداد گلبول قرمز را به‌طور معنی‏داری کاهش داد (05/0P<). براساس نتایج تحقیق حاضر، تزریق داخل تخم‏مرغی هورمون تیروکسین و استفاده از آرژنین در جیرۀ غذایی، عملکرد پرنده را به هنگام مواجهه با محیط‏های سرد بهبود می‏بخشد. 

کلیدواژه‌ها


عنوان مقاله [English]

Effects of thyroxin in ovo injection and post hatch arginine feed supplementation on performance and cold tolerance acquisition in broilers

نویسندگان [English]

  • Omid Afsarian 1
  • Mohamad Hosein Shahir 2
  • Hoshang Lotpholahian 3
  • Abdolah Hoseini 3
  • Naser Mousavi 4
  • Amir Akhlaghi 5
1 Ph.D. Student, Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjnan, Iran
2 Associated professor, Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjnan, Iran
3 Assistant Professor, Animal Physiology and Nutrition Branch, Animal Science Research Institue, Karaj, Iran
4 Assistant Professor, Department of Animal Science, Faculy of Agriculture, Islamic Azad University, Varamin, Iran
5 Associated Professor, Department of Animal Science, Faculty of Agriculture, University of Shiraz, Shiraz, Iran
چکیده [English]

Two experiments were conducted to evaluate the effects of thyroxin in ovo injection and post hatch arginine feed supplementation on performance and cold tolerance acquisition in broilers. In experiment 1, a total of 2400 hatchings eggs were randomly assigned to four treatments: Positive controls (intact or pricked with a needle), Negative control (intact egg), injected with distilled water and injected with thyroxin. In experiment 2, a total of 240 day old male broiler chicks from the intact and injected with thyroxin treatment groups were assigned in a 2 × 2 factorial trial based on completely randomized design, with two level of injection (non-injection or injected with 65ng of thyroxin) and two type of diet (without Arginine or 5 kg/ton Arginine). In order to induce ascites in chicks, all of the chicks were exposed to 15°C from 14 to 42 d of age. The results showed that the second grade chicks and yolk sac weight were decreased (P<0.05) in thyroxine by in ovo injection. Ascites mortality rate, packed cell volume percent and red blood cell count were decreased (P<0.05) by thyroxine injection and arginine supplementation. In conclusion, these results show that in ovo injection of thyroxin and arginine feed supplementation improves the performance during exposure to cold environments.

کلیدواژه‌ها [English]

  • arginine
  • hatchability
  • Incubation
  • In ovo injection
  • performance
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