نوع مقاله : مقاله پژوهشی
نویسندگان
استادیار گروه علوم‌دامی، مجتمع آموزش عالی تربت‌جام، تربت‌جام، ایران
چکیده
فناوری نانو به‌عنوان یک راهکار نوین می‌تواند شرایط هضم و جذب در نشخوارکنندگان را، بهبود بخشد. از این رو، با بررسی تأثیر نانو ذرات بر شرایط تخمیر شکمبه‌ای به‌صورت فراتحلیل، می‌توان به درک بهتری از نحوه کنترل تخمیر در محیط شکمبه دست یافت. پس از جستجو و انتخاب مقالات مناسب، داده‌های مربوط به فراسنجه‌های تخمیر شکمبه‌ای، استخراج گردید. به‌منظور انجام فراتحلیل از نرم‌افزار Comprehensive Meta-Analysis (CMA) نسخه 3 استفاده شد. از تفاوت میانگین استاندارد‌شده و شاخص Hedges’s g برای محاسبه اندازه اثر استفاده شد. برای بررسی میزان سوگیری انتشار از نمودار قیفی و آزمون‌های آماری استفاده گردید. اندازه اثر کلی به‌دست‌آمده برای برخی از نانو ذرات بر حجم گاز، غلظت اسیدهای چرب فرار، غلظت نیتروژن آمونیاکی و قابلیت هضم ظاهری معنی‌دار بود. مقادیر I2 برای اندازه اثر نانو ذرات بر حجم گاز و غلظت کل اسیدهای چرب فرار، نشان‌دهنده وجود ناهمگنی متوسط و برای غلظت نیتروژن آمونیاکی و قابلیت هضم ظاهری، نشان‌دهنده وجود ناهمگنی بالا بود. استفاده از نانو ذرات می‌تواند به‌دلیل داشتن تأثیرات مثبت بر رشد میکروبی، تحریک تجزیه الیاف، افزایش قابلیت هضم، افزایش غلظت کل اسیدهای چرب فرار، کاهش نسبت استات به پروپیونات و در نهایت کاهش تولید متان باعث بهبود فرآیند تخمیر شکمبه‌ای شود.
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