تأثیر سطوح مختلف اسیدهای آمینه و روش‌های دسترسی به دان بر عملکرد تولیدی و سیستم ایمنی جوجه‌های گوشتی

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 دانشیار گروه علوم دامی پردیس کشاورزی و منابع طبیعی دانشگاه تهران

3 عضو هیئت علمی مرکز تحقیقات علوم دامی کشور

4 دانشیار بخش ژنتیک و اصلاح دام گروه علوم دامی دانشکدة مهندسی کشاورزی دانشگاه صنعتی اصفهان

چکیده

هدف از این مطالعه، بررسی اثرات سطوح مختلف آمینو اسید و روشهای دسترسی به دان بر عملکرد و سیستم ایمنی جوجه های گوشتی بود. این آزمایش در قالب طرح کاملا تصادفی و به روش فاکتوریل با سه روش دسترسی به دان و دو سطح اسیدآمینه انجام شد. از 12 روزگی تا پایان دوره پرورش سه روش دسترسی آزاد به دان، محدودیت غذایی با دسترسی متناوب و محدودیت غذایی با دسترسی پیوسته به دان اعمال شد. جیره های آزمایشی شامل دو سطح اسید آمینه لیزین طبق سطح پیشنهادی سویه آرین و سطح 8 درصد بیشتر از آن بود. هر تیمار شامل 6 تکرار و هر تکرار دارای 23 قطعه جوجه گوشتی بود. محدودیت غذایی با دسترسی پیوسته به دان به‌طور معنی‌دار )05/0(P< سبب کاهش درصد تلفات و حذفی شد. با اعمال روش‌های خوراک‌دهی متناوب و پیوسته ضریب تبدیل غذایی به‌طور معنی‌دار )05/0(P< بهبود یافت. با افزایش سطح اسیدهای آمینه درصد لنفوسیت کاهش، درصد هتروفیل و نسبت هتروفیل به لنفوسیت افزایش ‌یافت )05/0(P

کلیدواژه‌ها

عنوان مقاله [English]

Effect of different levels of amino acids and feeding methods on growth performance and immune responses in broiler chickens

نویسندگان [English]

  • Kazem Yussefi Kelarikikolaee 1
  • Hossein Moravej 2
  • Seyyed Abdollah Hosseini 3
  • Abbas Pakdel 4
1
2
3
4
چکیده [English]

The objective of this study was to investigate the effects of different levels of amino acid and feeding methods on performance and immune system of broiler chickens. Experimental design was based on completely randomized design in a factorial arrangement with 3 feeding methods [control (ad libitum feed intake), intermittent feeding (IF) and continuous feed withdrawal (FW)), and 2 amino acid levels (level recommended by Arian and 8 % more). Each treatment was replicated 6 times with 23 male broilers per replicate. The CFW method was associated with a decreased mortality rate (P<0.05). The IF and FW methods improved feed conversion ratio (P<0.05). In CFW and IF feeding programs, the relative weight of spleen was increased (P<0.05). At higher amino acid level, the percentage of circulatory lymphocyte was decreased and that of heterophil and heterophil to lymphocyte ratio were increased (P<0.05). In conclusion, it seems that the FW feeding regimen with Arian recommended amino acid level might have a positive effect on the cellular but not the humeral immune system with no adverse effect on growth performance.

کلیدواژه‌ها [English]

  • broiler
  • Amino acid
  • feeding method
  • Immune system
  • performance

مراجع

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سابقه مقاله

  • تاریخ دریافت: 10 آذر 1392
  • تاریخ بازنگری: 03 مهر 1393
  • تاریخ پذیرش: 15 مهر 1393

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