The effect of rice husk as an insoluble dietary fiber source on intestinal morphology and Lactobacilli and Escherichia coli populations in broilers

Document Type : Nutrition - Hygiene


1 1Graduated from Department of Animal Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

2 2Department of Animal Sciences, University of Mohaghegh Ardabili, Ardabil, Iran


Background: There are some reports on the positive effects
of dietary insoluble fiber on the performance of broilers. Objectives: This study was carried out to determine the
effect of inclusion rate and particle size of rice husk in the diet of broilers
on the ileal and cecal bacteria populations and small intestine morphology. Methods: The experimental diets  consisted of a control husk-free diet and
four diets containing 7.5 or 15 g/kg rice husk with particle sizes of less than
1 mm or between 1-2 mm. Results:
The dietary insoluble fiber did not affect feed intake of the experimental
groups. The best body weight gain and feed conversion ratio was recorded in the
broiler chickens fed the diet containing 15g/kg rice hulls with particle size
of less than 1 mm (p<0.05). In the duodenum and jejunum, the crypt depth to
villi height ratio in the control group was significantly lower than other
groups (p<0.05). In the ileum, all the birds fed rice husk except the group
fed the diet that contained 15g/kg rice husk with particle size of 1-2 mm,
had  higher Lactobacilli and lower
E. coli and coliforms populations than the control group (p<0.05). Conclusions: The results of the present study suggest that
the 7.5g/kg dietary inclusion and more coarse particles size of rice husk (1-2
mm) were more effective to promote broiler growth performance. The positive
effects of dietary insoluble fiber on the growth performance of broilers in
this study are probably a result of favorable 
changes in the bacteria populations of the gastrointestinal tract and
not any improvement in small intestine absorptive capacit


Article Title [Persian]

اثر پوسته خارجی به عنوان یک منبع فیبر جیرههای نامحلول بر ریخت شناسی و جمعیت لاکتوباسیلوسها و اشریشیا کولی روده جوجههای گوشتی

Authors [Persian]

  • علی اباذری 1
  • بهمن نویدشاد 2
  • فرزاد میرزائی آقجه قشلاق 2
  • سعید نیکبین 2
1 دانش آموخته گروه علوم دامی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 2( گروه علوم دامی، دانشگاه محقق اردبیلی، اردبیل، ایران
Abstract [Persian]

زمینه مطالعه: گزارشهایی در مورد اثرات مثبت فیبر نامحلول جیره بر بازدهی جوجههای گوشتی وجود دارد. هدف: این مطالعه به منظور تعیین اثر سطح مصرف و اندازه ذرات پوسته برنج در جیره جوجههای گوشتی بر جمعیت باکتریایی ایلئوم و سکوم و ریخت شناسی روده کوچک انجام گرفت. روش کار: جیرههای آزمایشی عبارت بودند از یک جیره شاهد فاقد پوسته برنج و چهار جیره حاویg/kg 5/7 یا 15 پوسته برنج با اندازه ذرات کمتر از mm‌1 یا بین mm‌2-1. نتایج: فیبر نامحلول جیره مصرف خوراک گروههای آزمایشی را تحت تأثیر قرار نداد. بهترین افزایش وزن و ضریب تبدیل غذایی در جوجههای گوشتی تغذیه شده با جیره حاویش g/kg‌5 پوسته برنج با اندازه ذرات کمتر از mm‌1 ثبت شد (05/0 >p). در دودنوم و ژژنوم، نسبت عمق کریپت به ارتفاع ویلی در گروه شاهد به طور معنی داری کمتر از سایر گروهها بود (05/0 >p). در ایلئوم، تمام پرندههای تغذیه شده با پوسته برنج به استثناء گروه تغذیه شده با جیره حاوی g/kg 15 پوسته برنج با اندازه ذرات mm‌2-1، جمعیت لاکتوباسیلوسی بیشتر و جمعیتهای ا.کولی و کولیفورمهای کمتری نسبت به گروه شاهد داشتند (05/0 >p). نتیجهگیری نهایی: نتایج این تحقیق پیشنهاد مینماید که استفاده از سطح g/kg‌5/7 پوسته برنج با اندازه ذرات بزرگتر (mm 2-1) بطور موثری منجر به بهبود بازدهی رشد گردید. اثرات مثبت فیبر نامحلول جیره بر بازدهی رشد جوجههای گوشتی در مطالعه حاضر احتمالاً از بهبود در ظرفیت هضمی روده ناشی نشده ، بلکه در نتیجه ایجاد تغییراتی مطلوب در جمعیت باکتریایی مجرای روده بوده است.

Keywords [Persian]

  • اندازه ذرات
  • پوسته برنج
  • جمعیت باکتریایی روده
  • جوجه گوشتی
  • ریخت شناسی روده
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