اثر افزودن فیتاز میکروبی و پلی اتیلن گلیکول به جیره حاوی سورگوم بر عملکرد رشد و ثبات اکسیداتیو گوشت جوجه های گوشتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد تغذیه دام، گروه علوم دامی، دانشکده علوم کشاورزی، دانشگاه محقق اردبیلی

2 استادیار گروه علوم دامی، دانشکده علوم کشاورزی، دانشگاه محقق اردبیلی

چکیده

این آزمایش جهت بررسی اثر فیتاز میکروبی و پلی­اتیلن­گلیکول در جیره‌ حاوی سورگوم بر عملکرد و ثبات اکسیداتیو گوشت جوجه‌های گوشتی انجام شد. از 400 قطعه جوجه یک‌روزه سویه تجاری راس 308 در قالب طرح کاملاً تصادفی با 5 تیمار و 4 تکرار استفاده شد. تیمارها شامل جیره حاوی ذرت بدون افزودنی (شاهد)، جیره حاوی سورگوم بدون افزودنی یا مکمل شده با فیتاز (FTU/kg 500)، پلی­اتیلن­گلیکول (g/kg 1) و مخلوط آنها بودند که طی یک دوره 42 روزه به پرندگان تغذیه شدند. نمونه‌برداری از محتویات گوارشی و لاشه به دنبال کشتار در روز 24 صورت گرفت. مطابق نتایج، افزایش وزنِ مشابه جوجه‌ها در اثر سورگوم بدون افزودنی (3/2410 گرم) با شاهد (5/2442 گرم) و بهبود آن به وسیله مواد افزودنی مشاهده شد (01/0P<). pH شیرابه سنگدان و خاکستر استخوان درشت‌نی جوجه‌های تغذیه شده با جیره حاوی سورگوم در اثر فیتاز یا پلی­اتیلن­گلیکول افزایش یافت (05/0P<). میزان مالون‌دی‌آلدئید گوشت سینه و ران در اثر جیره حاوی سورگومِ بدون افزودنی (به ترتیب 22/0 و mg/kg 25/0) و فیتاز (به ترتیب 28/0 و mg/kg 33/0) در مقایسه با شاهد (به ترتیب 34/0 و mg/kg 40/0) کاهش یافت (001/0P<). فیتاز نسبت به شاهد هزینه خوراک را کاهش (15340 در مقابل 16701 ریال) و سود ناخالص را افزایش (20610 در مقابل 15593 ریال) داد (05/0P<). مطابق این یافته­ها، سورگوم به خوبی می­تواند جایگزین ذرت در جیره جوجه­های گوشتی شده و استفاده از فیتاز و یا پلی­اتیلن­گلیکول باعث بهبود اثرات تغذیه‌ای آن می­شود، اما برای حفظ ثبات اکسیداتیو گوشت و اقتصادی بودن پرورش استفاده از فیتاز بهتر است.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of adding a microbial phytase and polyethylene glycol to sorghum based diet on growth performance and meat oxidative stability of broiler chickens

نویسندگان [English]

  • A. R. Saghghaei 1
  • M. D. Shakouri 2
1 Former M.Sc. student of Animal Nutrition, Department of Animal Science, Faculty of Agricultural Sciences, University of Mohaghegh Ardabili, Ardabil, Iran
2 Assistant Professor of Department of Animal Science, Faculty of Agricultural Sciences, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

This experiment was conducted to investigate the effect of a microbial phytase and polyethylene glycol (PEG) supplementation in sorghum based diet on performance and meat oxidative stability of broiler chickens. A total of 400 one-day old Ross 308 chicks were used by employing a completely randomized design with 5 treatments and 4 replicates. Treatments including a corn based diet with no additive (control), sorghum based diets with no additive or with phytase (500 FTU/kg), PEG (1 g/kg) or phytase‌‌ + ‌‌PEG were fed to birds for a period of 42 days. Digesta and carcass were sampled on day 24 following the slaughter. According to the results, a similar weight gain for chickens on sorghum based diet with no additive (2410.3 g) and control (2442.5 g), and an improved weight gain for those received the additives was observed (P<0.01). Gizzard digesta pH value and ash content of tibia bone of chickens on sorghum based diet were increased by phytase or PEG (P<0.05). The amount of malondialdehyde in breast and thigh meats of broilers fed with sorghum with no additive (0.22 and 0.25 mg/kg respectively) and supplemented with phyatse (0.28 and 0.33 mg/kg respectively) was decreased compared with control (0.34 and 0.40 mg/kg respectively) (P<0.001). In comparison with control phytase declined the cost of feed (15340 vs. 16701 Rls) and increased gross profit (20610 vs. 15593 Rls) (P<0.05). Based on the findings, sorghum can be replaced for corn of broiler diets and its nutritive value can be improved by phytase or PEG supplementation. However, to achieve high meat oxidative stability and economic broiler production using phytase is preferred.

کلیدواژه‌ها [English]

  • Polyethylene glycol
  • Meat oxidative stability
  • Broiler chickens
  • Sorghum
  • Phytase

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تحقیقات تولیدات دامی
دوره 5، شماره 1
خرداد 1395
صفحه 53-62

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