Broiler Diets Formulated Based on Digestible Amino Acid Values as Determined by in vivo and Prediction Methods

محورهای موضوعی : Camel

م. صدقی ¹ , ا. گلیان ² , ف. کلاهان ³ , ع. هروی موسوی ⁴ , ع. افسر ⁵

1 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
2 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
3 - Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
4 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
5 - Evonik Degussa Iran AG, 1436935353, Tehran, Iran

تاریخ دریافت : 1392/02/21 تاریخ پذیرش : 1392/04/10 تاریخ انتشار : 1393/03/11

کلید واژه:

چکیده مقاله :

The aim of the present study was to assess whether near infrared reflectance spectroscopy (NIRS) and regression equations are the practical and accurate approach of nutritional assessment of common feedstuffs. Therefore two experiments were conducted to study the effect of amino acid determination methods on broiler performance. In experiment I, two hundred thirty four male Ross broiler chicks were fed a commercial starter diet from d 1 to 16 of age followed by the test diets from d 17 to 21 to determine the digestible amino acids content of wheat, corn and soybean meal. The 3 test diets consisted of corn, wheat or soybean meal was used as the sole sources of protein. On d 21, birds were killed and ileal digesta were collected for determining standardized ileal amino acid digestibility (SID). The in vivo values of SID were compared with values predicted by NIRS and regression methods. Experiment II was conducted to compare the effect of feed formulation based on SID determined by in vivo with regression and NIRS prediction methods on broiler performance. The results showed that the SID contents of wheat and corn predicted by NIRS and regression method were close to in vivo values. Values predicted by NIRS and regression for soybean meal varied when compared with those ofin vivo assay. Although, these differences were not appeared when comparing performance of broiler fed diets formulated based on SID values estimated throughin vivo trial, NIRS and regression methods. This study reveals that feed formulation based on digestible amino acids estimated by NIRS and regression methods are reliable for feed formulation in commercial poultry production.

چکیده انگلیسی:

هدف این مطالعه بررسی امکان استفاده از روش مادون قرمز (NIR) و معادلات رگرسیونی جهت تخمین اسیدهای آمینه مواد خوراکی مورد استفاده در تغذیه طیور بود. بنابراین دو آزمایش جهت بررسی تأثیر روش اندازه­‌گیری اسیدهای آمینه بر عملکرد جوجه­های گوشتی انجام شد. در آزمایش اول 234 قطعه جوجه خروس یک روزه تا سن 16 روزگی با یک جیره استاندارد تغذیه شدند. از روز 17 تا 21 جوجه‌ها با سه جیره غذایی جهت اندازه‌گیری قابلیت هضم اسیدهای آمینه ذرت، گندم و کنجاله سویا تغذیه شدند. جیره‌های غذایی به نحوی آماده شدند که هر یک از مواد خوراکی مورد بررسی به عنوان تنها منبع پروتئینی جیره مورد مطالعه بود. در روز 21 جوجه‌ها کشتار و محتویات ایلئومی جهت اندازه­گیری قابلیت هضم استاندارد شده مواد خوراکی (SID) جمع­آوری شد. اسیدهای آمینه قابل هضم مواد خوراکی به دست آمده از آزمایش حیوانی با داده‌های تخمین زده شده با NIR و روش رگرسیون مقایسه شدند. آزمایش دوم به منظور بررسی تأثیر جیره نویسی بر اساس SID به دست آمده از آزمایش حیوانی و تخمین زده شده با NIR و روش رگرسیون بر عملکرد جوجه­های گوشتی انجام شد. نتایج نشان داد مقادیر اسیدهای آمینه قابل هضم مواد خوراکی تخمین زده شده با NIR و معادلات رگرسیون با اعداد به دست آمده از آزمایشات حیوانی تفاوت زیادی نداشتند. ولی در مورد کنجاله سویا اعداد تخمین زده شده با NIR و معادلات رگرسیون با اعداد به دست آمده از آزمایشات حیوانی تفاوت داشت، هر چند این تفاوت در عملکرد جوجه­های تغذیه شده با مقادیر اسیدهای آمینه به دست آمده با روش­های مختلف اختلاف معنی‌داری نداشت. بنابراین نتایج این آزمایش نشان داد که جیره نویسی بر اساس اسیدهای آمینه قابل هضم تخمین زده شده با روش NIR و معادلات رگرسیون روشی قابل قبول جهت جیره نویسی در شرایط تجاری پرورش طیور می‌باشد. 

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