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تأثیر روش های خوراک دهی بر عملکرد و پیشگیری از عارضۀ آسیت در جوجه های گوشتی نر سویۀ آرین

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

2 استاد، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

چکیده

در این آزمایش تأثیر سه روش خوراک­دهی در چهار تکرار شامل: 1- بدون محدودیت خوراک؛ 2- محدودیت خوراک شش ساعت از 21-7 روزگی و چهار ساعت از 28-21 روزگی؛
3- محدودیت خوراک شش ساعت از 14-7 روزگی و چهار ساعت از 21-14 روزگی بر عملکرد و پیشگیری از عارضۀ آسیت شصت قطعه جوجۀ گوشتی نر سویۀ آرین در طول شش هفته با استفاده از طرح بلوک­های کامل تصادفی بررسی شد. در طول آزمایش وزن بدن، خوراک مصرفی، ضریب تبدیل غذایی، درصد تلفات و شاخص کارایی تولید تعیین شد. در 35 روزگی هماتوکریت و فراسنجه­های خونی اندازه­گیری شد. در پایان آزمایش ویژگی­های لاشه و نسبت بطن راست به‌کل بطن تعیین و مقایسه شد. محدودیت غذایی افزایش وزن بدن و مصرف خوراک را در کل دوره تحت تأثیر قرار نداد. محدودیت خوراک 21-7 روزگی شاخص تولید را بهبود داد (05/0>P). درصد تلفات ناشی از آسیت با اعمال محدودیت خوراک کاهش یافت (05/0>P). اعمال محدودیت خوراک تفاوت معنی­داری بر مقادیر هموگلوبین، گلبول‌های قرمز خون و هماتوکریت نداشت ولی سطح کورتیکوسترون را افزایش داد (05/0>P). هورمون T3 تحت تأثیر محدودیت خوراک قرار نگرفت ولی محدودیت خوراک 21-7 روزگی بیشترین میزان T4 را نسبت به محدودیت 14-7 روزگی داشت (05/0>P) و همچنین نسبت T3 به T4 با اعمال محدودیت خوراک کاهش یافت (05/0>P). با توجه به نتایج محدودیت خوراک شش ساعت از 21-7 روزگی و چهار ساعت از 28-22 روزگی کمترین میزان تلفات ناشی از آسیت را داشت و از سوی دیگر افزایش وزن بدن در کل دورۀ تفاوت معنی­داری با گروه شاهد نداشت.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of feed restriction methods on performance and prevention of ascites in Arian male broiler chickens

نویسندگان [English]

  • Behzad Sadighi 1
  • Mahmood Shivazad 2
  • Mojtaba Zaghari 2
1 Ph.D. Student, Department of Animal Sciences, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
2 Professor, Department of Animal Sciences, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

In this experiment, randomized complete block design with four replications was used for evaluating of the effect of three feeding methods including: without feed restriction (control group), 6 hours feed restriction from 7 to 21 days and 4 hours from 22 to 28 days, 6 hours feed restriction from 7 to 14 days and 4 hours from 15 to 21 days on performance and ascites prevention of Arian male broiler chickens in six weeks. Body weight, feed intake, feed conversion ratio, mortality rate and the index of production efficiency were determined during the experiment. Hematocrit and blood parameters were measured at 35 days of age. Carcass characteristics and the right ventricle weight per total ventricle weight (RV:TV) ratios were determined and compared. Feed conversion ratio and production index was improved by feed restriction from 7-21 days (P<0.05) at 42 days. With applying feed restriction ascites mortality was reduced (P<0.05). Applied feed restriction methods on the amount of hemoglobin, red blood cells and hematocrit had no significant effect, but increased levels of corticosterone (P<0.05). Although T3 hormone was not affected by feed restriction but T4 was increased by feed restriction from 7 to 21 days (P<0.05). In addition, T3 to T4 ratios was reduced by feed restriction (P<0.05).The results of this experiment indicated that, 6 hours feed restriction from 7 to 21 days and 4 hours from 22 to 28 days had the lowest ascites mortality and increased body weight insignificantly.

کلیدواژه‌ها [English]

  • Arian male broiler chickens
  • ascites
  • Feed restriction
  • growth performance
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