تعیین و مقایسه معادلات تخمین انرژی قابل سوخت و ساز برخی از ارقام گندم ایرانی با معادلات و اطلاعات جدول NRC بر اساس عملکرد تولیدی جوجه‏های گوشتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پردیس کشاورزی و منابع طبیعی کرج

2 عضو هیئت علمی گروه علوم دامی پردیس کشاورزی و منابع طبیعی کرج- دانشگاه تهران

چکیده

به منظور تعیین معادلات تخمین انرژی قابل سوخت و ساز تصحیح شده بر اساس ابقاء صفر نیتروژن (AMEn) در رایج‌ترین ارقام گندم ایرانی و مقایسه این معادلات با معادله ارائه شده توسط NRC1994 و همچنین اطلاعات جدول NRC1994، دو آزمایش انجام شد. در آزمایش اول با استفاده از 12 رقم گندم ایرانی در دو سال زراعی متوالی و تعیین ترکیبات شیمیایی و AMEn آنها، معادلات رگرسیونی پیش‏بینی کننده AMEn برای جوجه‏های گوشتی در دو سن 10 و 24 روزگی به دست آمد. آزمایش دوم در قالب طرح کاملاً تصادفی با چهار تیمار و چهار تکرار و با استفاده از 256 قطعه جوجه 10 روزه از هیبرید تجاری راس 308 و به منظور بررسی صحت و دقت معادلات به دست آمده از آزمایش اول، انجام شد.AMEn  گندم موجود در تیمارهای آزمایش دوم با استفاده از چهار روش زیر به دست آمد: 1- جدول NRC 2- معادله پیش‌بینیNRC 3- روش حیوانی 4- معادلات به دست آمده در آزمایش اول. معادلات تخمین AMEn در آزمایش اول برای سن 10 روزگی به صورت AMEn = 37.289 NFE و برای سن 24 روزگی بصورتAMEn = 41.859 NFE  به دست آمد. در آزمایش دوم بیشترین میانگین وزن زنده در 42 روزگی مربوط به تیمار معادلات تخمین آزمایش اول (2542 گرم) و کمترین مربوط به تیمار جدول NRC (2266گرم) بود (05/0P<). صفات عملکردی در تیمارهای مربوط به روش حیوانی و معادلات بدست آمده در آزمایش اول نسبت به تیمارهای مربوط به معادله تخمین NRC و جدول NRC بهتر بود (05/0P<). نتایج حاصل از این آزمایش استفاده از معادلات تخمین ارائه شده در این تحقیق را جهت برآورد دقیق‏تر AMEn گندم در هنگام جیره‏نویسی پیشنهاد می‌کند.

کلیدواژه‌ها


عنوان مقاله [English]

Determination and comparison of the estimating equitions of some Iranian wheat cultivars with the equitions and information of NRC based on the production performance of broiler

نویسنده [English]

  • Hossein Moravej 2
2 Academic member
چکیده [English]

In order to determine the estimating equations of the apparent metabolisable energy corrected for the nitrogen (AMEn) in Iranian wheat cultivars and to compare these equations with the equation provided by NRC1994 as well as information of the NRC1994 table, two experiments were conducted. In the first experiment, the regression equations predicting AMEn for broiler chickens at age 10 and 24 days were evaluated by using twelve different Iranian wheat cultivars in two consecutive crop years and corresponding chemical composition and their AMEn. In order to verify the authenticity and accuracy the results of first experiment, a second experiment was conducted in a completely randomized design with four treatments and four replicates and using 256 ten days-old chicks Ross308. Wheat AMEn in the second experiment was calculated using four methods: 1- NRC1994 Table 2- Regression equation provided by NRC1994 3- Biological methods in these study 4- Regression equations of the first trial. In the first experiment, regression equations used for predicting AMEn of wheat at 10 and 24 days of age were as follows: AMEn=37.289 NFE and AMEn=41.859 NFE. In the second experiment, the highest average live weight at 42 days belongs to the birds in fourth treatment (2542g) and lowest weight in first treatment (2266g). Traits related to performance in biological methods and equations obtained in the first experiment were better than the treatments derived from the regression equation by NRC and NRC tables (P<0.05). Our results suggest that applying the regression equations presented in the current study to estimate the AMEn of wheat is more accurate in formulating diet.

کلیدواژه‌ها [English]

  • Basal diet
  • chemical analysis
  • Chromium oxide
  • Coefficient of determination
  • Nitrogen free extract
  • replacement level
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