Energy Type and Amount in the Diets of Broiler Chickens: Effects on Performance and Duodenal Morphology
محورهای موضوعی : Camelا. قهرمانی 1 , ع.ا. صادقی 2 , س. حصارکی 3 , م. چمنی 4 , پ. شورنگ 5
1 - Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 - Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran
3 - Deptartment of Veterinary Medicine, Science and Research Branch, Islamic Azad University, Tehran, Iran
4 - Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran
5 - Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran, Karaj, Iran
کلید واژه: energy, Performance, broiler chickens, duodenum morphology, soy oil,
چکیده مقاله :
The present study was conducted to investigate the effects of dietary energy sourcesandlevels on performance and small intestinal morphology in broiler chickens. A total of 600 one-day-old broiler chicks were randomly divided into five treatments with four replicates each. Chicks were fed diet based on corn as main energy source and energy level based on Cobb 500 manual instruction considered control group (C), basal diet with 3% lesser energy than control (T1), basal diet with 6% lesser energy than control (T2), basal diet based on corn and soy oil level according to Cobb 500 manual instruction (T3), basal diet based on corn and soy oil with 3% upper energy (T4) for 42 days. Results showed that chicks in T3 group had higher body weight, body weight gain and duodenum villus height compared to control group (C) and improved feed conversion ratio (FCR) at day 42 of age (P<0.05). Chicks in T2 group exhibited the lowest body weight (BW), body weight gain (BWG) and FCR but the highest feed intake (P<0.05). Feeding of diet T4 improved daily weight gain and duodenal villus height while caused concurrently increased FCR. Energy levels greater than Cobb recommendation significantly increased the villus height of the duodenum and decreased crypt depth compared to the control group (P<0.05). In order to achieve a higher weight more energy is needed than the recommended manual instruction for Cobb 500 but to have better feed conversion ratio the energy level recommended manual instruction is sufficient.
هدف از انجام مطالعه حاضر ارزیابی اثرات منابع و سطوح مختلف انرژی بر عملکرد، شاخصهای مورفولوژیکی روده کوچک جوجههای گوشتی بود. تعداد 600 قطعه جوجه گوشتی یکروزه به صورت تصادفی در 5 تیمار و 4 تکرار قرار داده شدند. جوجهها با جیره پایه ذرت به عنوان منبع اصلی انرژی و سطح انرژی بر اساس کاتالوگ راهنمای کاب 500 در گروه کنترل (C)، جیره پایه با 3 درصد انرژی کمتر از کنترل (T1)، جیره پایه با 6 درصد انرژی کمتراز کنترل (T2)، جیره پایه با ذرت و روغن سویا و سطح انرژی بر اساس کاتالوگ راهنمای کاب 500 (T3)، جیره پایه با ذرت و روغن سویا و سطح انرژی 3 درصد بالاتر (T4) برای مدت 42 روز تغذیه شدند. نتایج نشان داد، جوجههای گروه T3 وزن بدن، افزایش وزن و ارتفاع پرز دئودنوم بالاتری در مقایسه با گروه کنترل (C) داشته و ضریب تبدیل غذایی در 42 روزگی بهبود یافت (05/0>P). جوجهها در گروه T2 پایینترین وزن بدن، افزایش وزن، ضریب تبدیل غذایی اما بیشترین مصرف خوراک را نشان دادند (05/0>P). تغذیه با جیره تیمار T4 افزایش وزن روزانه و ارتفاع پرز دئودنوم را بهبود بخشید در حالی که به طور همزمان ضریب تبدیل غذایی را افزایش داد. در مقایسه با گروه کنترل، سطوح انرژی بالاتر از نیازهای غذایی کاب به طور معنیداری ارتفاع پرز در دئودنوم را افزایش داد و عمق کریپت را کاهش داد (05/0>P). به منظور دستیابی به وزن بالاتر، انرژی بیشتری از مقدار توصیه شده برای کاب 500 نیاز است اما برای داشتن بازده غذایی بهتر سطح انرژی بر اساس کاتالوگ کاب 500 کافی است.
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