نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، اهواز، ایران،

2 نویسنده مسئول، گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، اهواز، ایران، رایانامه: s.salari@asnrukh.ac.ir

3 گروه مهندسی طبیعت، دانشکده کشاورزی شیروان، دانشگاه بجنورد، بجنورد، ایران،

4 گروه علوم پایه دامپزشکی، دانشکده دامپزشکی، دانشگاه شهید چمران اهواز، ایران،

چکیده

این مطالعه به‌منظور بررسی اندازه ذرات جو و مخمر اتولیز شده به همراه آنزیم بر عملکرد، سیستم ایمنی و قابلیت هضم ایلئومی با استفاده از 400 قطعه جوجه گوشتی مخلوط دو جنس دورگه راس 308 در قالب طرح کاملاً تصادفی با آرایش فاکتوریل 2×4 و با 8 تیمار و 5 تکرار از سن 1 تا 35 روزگی انجام شد. تیمارهای آزمایشی شامل نوع افزودنی (بدون افزودنی، آنزیم، مخمر اتولیز شده و مخمر اتولیز شده به همراه آنزیم) و اندازه ذرات جو (ریز،2 میلی متر و درشت، 8 میلی متر) بودند. افزودن مخمر اتولیز شده و آنزیم، باعث بهبود ضریب تبدیل خوراک نسبت به تیمار بدون افزودنی گردید (p<0/05). مخمر اتولیز شده با اندازه ذرات درشت جو، سبب افزایش فاکتور بازدهی اروپایی، نسبت بازدهی انرژی و پروتئین نسبت به سایر تیمارها گردید (0/05>P). افزودن آنزیم چربی محوطه‌ی بطنی را نسبت به سایر تیمارها کاهش داد (p<0/05). مخمر اتولیز شده به‌همراه آنزیم باعث افزایش طول و درصد ماده خشک استخوان درشت‌نی نسبت به تیمار فاقد افزودنی شد (p<0/05). افزودن مخمر اتولیز شده به‌همراه آنزیم پاسخ ایمنی را نسبت به سایر تیمارها بهبود بخشید (p<0/05). مخمر اتولیز شده به همراه آنزیم، قابلیت هضم ایلئومی را نسبت به سایر تیمارها بهبود بخشید (05/0>P). مخمر اتولیز شده به تنهایی و به‌همراه آنزیم باعث کاهش میزان pH بستر، نسبت به تیمار دریافت کننده‌ی آنزیم به تنهایی و تیمار فاقد افزودنی گردید (0/05>P). در مجموع، می‌توان استفاده از مخمر اتولیز شده به همراه آنزیم را در جیره‌های حاوی جو جوجه‌های گوشتی توصیه نمود.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of barley particle size and autolyzed yeast with enzyme on performance, immune system and ileal digestibility of broiler chickens

نویسندگان [English]

  • Leili Abdali 1
  • Somayyeh Salari 2
  • Mohammad Reza Ghorbani 3
  • Shima Hossini Far 4

1 Department of Animal Science, Animal Science and Food Technology Faculty, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Iran

2 Department of Animal Science, Animal Science and Food Technology Faculty, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Iran

3 Department of Nature Engineering, Shirvan Faculty of Agriculture, University of Bojnord, Bojnord, Iran

4 Department of Biochemistry and Molecular, Veterinary Medicine Faculty, Shahid Chamran University of Ahvaz, Ahvaz, Iran

چکیده [English]

An experiment was conducted to determine the effects of autolyzed yeast with enzyme supplementation and barley particle size on energy and protein efficiency ratio, immune system and ileal digestibility with 400 one-day-old Ross 308 broiler chickens from both sexes in completely randomized design with factorial arrangement 2×4 with 8 treatments, 5 replicates from 1 to 35 days of age. The experimental treatments included type of additive (without additive, enzyme, autolyzed yeast and autolyzed yeast with enzyme) and barley particle size (fine (2 mm) and coarse (8 mm)). Supplementation of autolyzed yeast and enzyme improved FCR compared to the treatment without additives (P>0.05). Autolyzed yeast with coarse barley particles increased the European efficiency factor, energy and protein efficiency ratio compared to other treatments (P>0.05). Supplementation of enzyme led to a decrease in abdominal fat percentage compared to other treatments (P<0.05). Autolyzed yeast with enzyme increased the length and dry matter percentage of the tibia compared to the treatment without additives (P<0.05). Addition of autolyzed yeast with enzyme improved the response immune system compared to other treatments (P<0.05). Supplementation of autolyzed yeast with enzyme improved the ileal digestibility compared to other treatments (P<0.05). Addition autolyzed yeast alone and with enzyme decreased litter pH compared to the treatment receiving enzyme alone and the treatment without additive (P<0.05). As summary, autolyzed yeast with enzyme can be used to improve the performance of broiler chickens fed diets containing barley.

کلیدواژه‌ها [English]

  • Abdominal fat
  • Energy efficiency ratio
  • European efficiency factor
  • Litter
  • Tibia
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