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طاهر یلچی جمال سيف دواتي رضا سيد شريفي

چکیده

اين پژوهش به منظور بررسي آثار همزمان سازي تخمير شكمبه­اي ماده مغذي بر فراسنجه­هاي شكمبه­اي، ساخت پروتئين ميكروبي و تعادل نيتروژن در گوسفند انجام شد. تركيبات شيميايي به همراه فراسنجه­هاي تجزيه پذيري پروتئين خام و كربوهيدرات علوفه يونجه، كاه گندم، ‌دانه جو،‌ دانه ذرت،‌ تفاله چغندرقند،‌ سبوس گندم و كنجاله سويا اندازه­گيري شد. سه جيره با انرژي و پروتئين خام يكسان اما با شاخص همزماني متفاوت شامل 64/0، 78/0 و 92/0 كه با استفاده از فراسنجه­هاي تجزيه­پذيري مواد خوراكي محاسبه شده بودند،‌ تنظيم شدند. از شش رأس گوسفند 14 ماهه با ميانگين وزن 17/1±17/30 كيلوگرم داراي فيستوله شكمبه­اي در قفس­هاي متابوليكي استفاده شد. طرح آزمايشي در قالب طرح مربع لاتين تكرار شده در سه دوره و اختصاص دو گوسفند به هر جيره آزمايشي در هر دوره انجام شد. نتايج نشان داد كه با افزايش شاخص همزماني غلظت نيتروژن آمونياكي شكمبه به ويژه در 5/1 ساعت بعد از مصرف خوراك كاهش يافت. غلظت كل اسيدهاي چرب فرار در 3 ساعت بعد از تغذيه در جيره­اي كه بيشترين شاخص همزماني را داشت بيشترين مقدار بود. با افزايش شاخص همزماني غلظت كل اسيدهاي چرب فرار به ويژه غلظت پروپيونات نيز افزايش معني­داري داشت. كل مشتقات پوريني دفع شده يا جذب شده و ساخت پروتئين ميكروبي تحت تأثير جيره­هاي آزمايشي قرار نگرفت. با افزايش شاخص همزماني كل نيتروژن دفع شده كاهش و بازدهي ابقاء نيتروژن افزايش يافت. هرچند در اين پژوهش ساخت پروتئين ميكروبي تحت تأثير قرار نگرفت اما ساير نتايج مثبت از جمله بهبود تخمير در شكمبه و ابقاء نيتروژن در بدن، استفاده از شاخص همزماني را در تنظيم جيره­هاي غذايي براي نشخواركنندگان به ويژه گوسفندان قابل توصيه مي­نمايد.

جزئیات مقاله

کلمات کلیدی

ابقاء نيتروژن, تخمير شكمبه¬اي, شاخص همزماني, نيتروژن آمونياكي, نيتروژن اوره¬اي خون

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ارجاع به مقاله
یلچیط., سيف دواتيج., & سيد شريفير. (2019). تأثير همزمانی ماده مغذی بر تخمیر شکمبه¬ای، ساخت پروتئین میکروبی و تعادل نیتروژن در گوسفند. پژوهشهای علوم دامی ایران, 12(1), ۱۹-۳۳. https://doi.org/10.22067/ijasr.v12i1.76961
نوع مقاله
علمی پژوهشی - تغذیه نشخوارکنندگان