تاثیر اندازه ذرات کربنات کلسیم و آنزیم فیتاز بر عملکرد، کیفیت تخم مرغ و قابلیت هضم ظاهری کلسیم در مرغان تخمگذار تجاری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم دامی، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی، کرمانشاه، ایران

2 مرکز تحقیقات تک معده ایها، دانشکده کشاورزی و محیط زیست، دانشگاه مسی، نیوزیلند.

چکیده

این پژوهش به­منظور بررسی اثر اندازه ذرات کربنات کلسیم و آنزیم فیتاز بر عملکرد تولیدی، صفات کیفی تخم مرغ و قابلیت هضم ظاهری کلسیم، در مرغان تخمگذار تجاری انجام شد. آزمایش با 216 قطعه مرغ تخمگذار در قالب طرح کاملا تصادفی و بصورت آزمایش فاکتوریل در شش تیمار آزمایشی و شش تکرار به ازاء هر تیمار از سن 19-26 هفتگی انجام شد. عوامل مورد مطالعه شامل سه اندازه ذرات کربنات کلسیم (ریز (کمتر از 5/ 0 میلی‌متر)، متوسط (5/0-2 میلی‌متر) و درشت (2-4 میلی‌متر)) و دو سطح آ نزیم فیتاز (0 و 300 واحد در کیلوگرم جیره) بودند. درصد تولید تخم مرغ و گرم تخم مرغ تولیدی تحت تاثیر تیمارهای آزمایشی قرار نگرفت. افزودن فیتاز به جیره موجب افزایش عددی وزن تخم مرغ در 3 هفته دوم آزمایش (P=0.06)  و کل دوره آزمایش گردید ((P=0.1).  اندازه ذرات ریز و درشت کربنات کلسیم، ضخامت پوسته تخم‌مرغ را در مقایسه با اندازه متوسط ((P˂0.01)  افزایش داد و افزودن آنزیم فیتاز، موجب افزایش درصد پوسته تخم مرغ گردید (P˂0.05).  ضریب قابلیت هضم ظاهری کلسیم در جیره‌های حاوی کربنات کلسیم با اندازه ریز و متوسط بالاتر از اندازه درشت(P˂0.0001)  بود. اندازه ذرات متوسط(P˂0.05)  موجب کاهش رنگ زرده گردید. اندازه ذرات متوسط کربنات کلسیم موجب بهبود قابلیت هضم ماده خشک در مقایسه با اندازه ریز و درشت گردید. نتایج این تحقیق نشان داد که اندازه ذرات کربنات کلسیم بر صفات تولیدی تاثیرگذار نیست، اندازه ریز و متوسط کربنات کلسیم بدلیل افزایش قابلیت هضم کلسیم در دستگاه گوارش در مقایسه با اندازه درشت (2-4 میلی‌متر) در مرغ‌های جوان توصیه می‌گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Influence of limestone particle size and phytase enzyme on performance, egg quality, and total tract retention of Ca in commercial laying hens

نویسندگان [English]

  • Soudabeh Moradi 1
  • Mohammed Abd Oun Jawad 1
  • M.Reza Abdollahi 2
1 Department of Animal Science, Faculty of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
2 2Monogastric Research Center, School of Agriculture and Environment, Massey University, Palmerston North, 4442, New Zealand
چکیده [English]

The aim of this study was to evaluate the effect of limestone particle size and phytase enzyme supplementation on production performance, egg quality traits, and coefficient of apparent digestibility of calcium of commercial laying hens. A total of 216 laying hens were randomly distributed in six treatments, and six replicates per each. The design consisted of a factorial arrangement of three particle sizes of limestone from the same source (fine (<0.5 mm), medium (0.5-2 mm) and coarse (2-4 mm)) and two phytase levels (0 and 300 (FTU)/kg) in a completely randomized design. Egg production and egg mass were not influenced by experimental diets. Phytase inclusion numerically increased egg weight in second (P=0.06) and whole trial period (20-26 wk, P=0.1). Fine and coarse particles of limestone increased shell thickness (P < 0.01), compared to medium particles, also phytase supplementation improved shell percent (P < 0.01). Fine and medium sizes of limestone resulted in a higher apparent digestibility coefficient of Ca compared to coarse size ((P < 0.0001),0.43, and 0.45 vs. 0.33). Diets containing medium limestone size showed lighter yolk color than those containing fine and coarse particles (P˂0.05). Medium size of limestone significantly increased digestibility of DM compared to fine and coarse particles. In conclusion, productive performance of laying hens did not respond to limestone particle size, however, fine and medium sizes of limestone through enhancing effect on Ca digestibility, is more suitable than coarse particles for practical applications in young layers.

کلیدواژه‌ها [English]

  • limestone
  • phytase enzyme
  • particle size
  • laying hens
  • apparent digestibility of Ca

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علوم دامی ایران
دوره 54، شماره 4
آذر 1402
صفحه 403-417

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  • تاریخ دریافت: 03 آذر 1401
  • تاریخ بازنگری: 13 اسفند 1401
  • تاریخ پذیرش: 16 اسفند 1401

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