Determination of standardized prececal protein digestibility of canola meal in British United Turkeys Big 6 at different ages using multiple linear regression procedure

Authors

Department of Animal Science, College of Agriculture, Shiraz University, Shiraz, I. R. Iran

Abstract

ABSTRACT- Ninety six 2-week-old British United Turkeys (BUT) Big 6 were assigned to 2 groups (4 replicates of 12 birds each). One basal diet and another one in which 20% canola meal replaced the corn starch in the basal diet were prepared. At 9, 16 and 21 wk of age, four birds from each pen slaughtered for digesta collection. The last two-third segment of the intestine, between the Meckel’s diverticulum and about 2 cm anterior to the ileo-ceca-colonic junction, was excised. The diets and digesta were analyzed for dry matter, crude protein, and chromic oxide content. The standardized prececal protein digestibility of canola meal was calculated using multiple linear regression procedure. The standardized prececal protein digestibility of canola meal at 21 wk of age was significantly lower as compared with that of 9 wk of age; the relative weight of digestive organs also decreased significantly with increasing age (P< 0.05). By using multiple linear regression which accounted for the endogenous nitrogen losses, we showed that standardized prececal protein digestibility was also influenced by the age.

Keywords

Main Subjects


Article Title [Persian]

تعیین گوارش پذیری استاندارد پیش سکومی پروتئین کنجاله کلزا

Authors [Persian]

  • محمد رضوانی
  • امیر اخلاقی
  • فاطمه صائمی
  • محمد مهدی امتی
  • محمد دادپسند
  • هادی آتشی
گروه علوم دامی، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ج. ا. ایران.
Abstract [Persian]

چکیده- نود و شش قطعه بوقلمون نژاد انگلیسی بیگ-6 در سن 2 هفتگی به دو گروه (هر گروه شامل4 تکرار و هر تکرار 12 پرنده) تقسیم شدند. یک جیره ی پایه و یک جیره ی دارای 20 درصد کنجاله کانولا که جانشین نشاسته ی ذرت در جیره ی پایه شده بود، آماده شدند. در سن 9، 16 و 21 هفتگی چهار پرنده از هر تکرار برای جمع آوری مواد هضمی روده کشتار شدند. قطعه‏ی دو سوم انتهایی روده حدفاصل زایده مکل و 2 سانتی متر قبل از محل اتصال ایلئوم به سکوم بریده شد. ماده ی خشک، پروتئین خام و مارکر خارجی اکسید کروم در جیره های غذایی و مواد هضمی اندازه گیری شدند. گوارش پذیری استاندارد پیش سکومی پروتئین کنجاله کانولا با روش رگرسیون چند متغییره محاسبه شد. گوارش پذیری استاندارد پیش سکومی پروتئین کنجاله کانولا در سن 21 هفتگی به طور معنی داری کمتر از سن 9 هفتگی بود و وزن نسبی اندامهای گوارشی نیز روند کاهشی معنی داری را با افزایش سن نشان داد  (P< 0.05). با وجود تصحیح انجام شده برای نیتروژن دارای منشاء داخلی در روش رگرسیون خطی چند متغییره، مشاهده شد که گوارش پذیری استاندارد پیش سکومی پروتئین کنجاله کانولا تحت تاثیر سن پرنده قرار دارد.

Keywords [Persian]

  • واژه های کلیدی:
  • گوارش پذیری استاندارد پروتئین
  • رگرسیون چند متغیره
  • کنجاله کانولا
  • بوقلمون های نژاد انگلیسی بیگ 6
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