اثرات طول دوره ‌آغازین و سطح پروتئین خام جیره بر عملکرد، صفات لاشه و مورفولوژی روده در جوجه‌های گوشتی

نوع مقاله : مقاله پژوهشی

نویسنده

گروه علوم دامی، واحد مراغه، دانشگاه آزاد اسلامی، مراغه، ایران

10.22034/aej.2021.314828.2684

چکیده

پژوهش حاضر به منظور بررسی تأثیر سطوح مختلف پروتئین خام و مدت زمان تغذیه از جیره‌ آغازین بر عملکرد، صفات لاشه و مورفولوژی روده جوجه‌های گوشتی انجام شد. تعداد 288 قطعه جوجه گوشتی راس- 308 در قالب طرح کاملاً تصادفی با آرایش فاکتوریل (3×2) شامل 2 سطح پروتئین خام جیره (توصیه راس و 5 درصد بیش تر از آن) استفاده شد. کاهش طول دوره به 7 روز باعث کاهش مقدار خوراک مصرفی و افزایش وزن روزانه و وزن نهایی و افزایش طول دوره به 16 روز موجب افزایش آن ها شد. افزایش 5 درصدی پروتئین خام جیره موجب افزایش خوراک مصرفی در کل دوره شد (0/05>P). کاهش یا افزایش خوراک مصرفی و وزن بدن در اثرات متقابل طول دوره و سطح پروتئین جیره نیز مشاهده شد. ضریب تبدیل خوراک و صفات لاشه تحت تأثیر طول دوره آغازین و سطح پروتئین جیره در انتهای آزمایش قرار نگرفت (0/05<P). از نظر طول پرز و عرض پرز در سن 42 روزگی اختلاف معنی‌داری بین تیمارها مشاهده شد (0/05>P). به طوری‌ که طول و عرض پرز در تیمار با طول دوره 7 روز افزایش معنی‌داری را نسبت به سایر تیمارها نشان داد و افزایش 5 درصدی پروتئین باعث کاهش معنی‌داری در مختصات پرز روده شد. جوجه‌های گوشتی کاهش طول دوره استفاده از جیره آغازین با کاهش مقدار خوراک مصرفی و افزایش وزن، موجب کاهش وزن نهایی و افزایش طول دوره استفاده از جیره آغازین با افزایش مقدار خوراک مصرفی و افزایش وزن، موجب افزایش وزن نهایی جوجه‌ها می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The effects of starter period length and crude protein level of diets on performance, carcass traits and intestinal morphology of broilers

نویسنده [English]

  • Ali Nobakht
Department of Animal Science, Maragheh Branch, Islamic Azad University, Maragheh, Iran
چکیده [English]

This study was conducted to investigate the effects using different levels of dietary crude protein starter period length on performance, carcass characteristics and intestinal morphology of broilers. 288 Rass 308 broilers were used as factorial arrangement (2*3) included 2 levels of dietary cured protein (Rass company recommended and 5% more than it) and 3 starter period length included (7, 10 and 16 days) in a completely randomized design. Reduce the starter period length to 7 days reduced the amount of feed intake and weight gain, whereas increase the starter period length to 16 increased the amount of feed intake, weight gain and final live weight (P<0.05Reduce or increase of the amount of feed intake and weight gain were observed in interaction between starter period length and crude protein levels (P<0.05). Starter period length and crude protein levels had not significant effect on feed conversion ratio and carcass traits (P>0.05). Starter period length and crude protein level had significant effects on intestinal morphology (P<0.05). Reduce the starter period length to 7 days increased the intestinal villi width and length, whereas using crude protein 5% more than Ross recommendation reduce them. In broilers reduce the length of using stater period diet via reduce of the amounts of daily feed consumption and weight gain, reduce the final weight, whereas increase of the use of starter period via increase the amounts of daily feed intake and weight gain, incearse the final weight.

کلیدواژه‌ها [English]

  • Broiler
  • Carcass Characteristics
  • Performance
  • Starter diet
  • Intestinal Morphology

مراجع

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فصلنامه محیط زیست جانوری
دوره 14، شماره 4
بهمن 1401
صفحه 153-160

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