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تأثیر مکمل آلی عنصر روی بر عملکرد، پاسخ ایمنی، جمعیت میکروبی سکوم و قابلیت هضم مواد مغذی در جوجه های گوشتی پرورش یافته تحت تنش تراکم

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان

2 دانشیار، گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان

3 استادیار، گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان

چکیده

به­منظور بررسی مکمل آلی عنصر روی­ در تغذیه جوجه­های گوشتی پرورش یافته در شرایط متفاوت تراکم، آزمایشی با استفاده از دو سطح تراکم (10 و16 قطعه پرنده در هر مترمربع) و 4 سطح عنصر روی (40، 80، 120 و 160 میلی­گرم در کیلوگرم) در قالب طرح کاملا تصادفی به روش فاکتوریل 2×4 انجام گردید. نتایج در 1 تا 21 روزگی نشان داد ، پرندگان پرورش یافته در تراکم بالا کمترین میزان خوراک مصرفی و ضریب تبدیل خوراک را نسبت به تراکم نرمال و د­­­­ر 22 تا 42 روزگی پرندگان پرورش یافته در تراکم نرمال کمترین خوراک مصرفی و ضریب تبدیل خوراک را داشتند (05/0>P). با افزایش سطح عنصر روی در جیره، جمعیت باکتری­های کلی­فرم سکوم جوجه‌ها در شرایط تراکم نرمال و بالا کاهش نشان داد (05/0>P). قابلیت هضم ایلئومی پروتئین با افزایش سطح عنصر روی در جیره در شرایط تراکم نرمال و بالا افزایش یافته است (05/0>P).یافته­های پژوهش حاضر نشان داد که افزودن عنصر روی در شرایط پرورش متراکم نتوانست فراسنجه‌های عملکردی را تحت تأثیر قرار دهد، اگرچه با افزایش سطح عنصر روی در جیره، قابلیت هضم ایلئومی پروتئین خام و ماده آلی افزایش و جمعیت میکروبی کلی فرم و ای‌کولای در سکوم جوجه‌های گوشتی کاهش یافت.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of organic zinc supplement on performance, immunity responses, cecal microbial population and digestibility of nutrients in broiler chickens reared at high stocking density

نویسندگان [English]

  • Vrya Rasooli 1
  • Somayyeh Salari 2
  • Ahmad Tatar 3
1 Former M. Sc. Student, Department of Animal Science, Faculty of Animal Science and Food Industry, Agricultural Sciences and Natural Resources University of Khuzestan, Iran
2 Associate Professor, Department of Animal Science, Faculty of Animal Science and Food Industry, Agricultural Sciences and Natural Resources University of Khuzestan, Iran
3 Assistant Professor, Department of Animal Science, Faculty of Animal Science and Food Industry, Agricultural Sciences and Natural Resources University of Khuzestan, Iran
چکیده [English]

In order to investigate the effect of organic zinc (Zn) supplement in broiler chicken nutrition that reared at high stock density, this experiment was done by using 2 levels of density (10 and 16 birds/m2) and 4 levels of Zn (40, 80, 120 and 160 ppm) in a completely randomized design with 4×2 factorial arrangement. The results showed that birds with higher stocking density had lower feed intake (FI) and feed conversion ratio (FCR) compared to those in normal density from d 1-21 and birds with normal stocking density had lowest FI and FCR from d 22-42 (P<0.05). Cecal population of Coliform decreased in normal and high stock density by increasing Zn level in the diet (P<0.05). Apparent ileal digestibility of crude protein significantly increased by increasing the levels of Zn in the diet in normal and high stock density (P<0.05). These data suggest that dietary supplementation of Zn significantly increased ileal digestibility of crude protein and organic matter and also, decreased cecal population of Coliform and E. coli in high and normal stocking density without affecting the performance of broilers. 

کلیدواژه‌ها [English]

  • Broiler Chicken
  • cecal bacteria
  • high stock density
  • ileal digestibility
  • weight gain
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