نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه، ایران.
2 استاد، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه، ایران.
چکیده
مطالعه حاضر به منظور بررسی اثر افزودن سطوح مختلف ذرت علوفه‌ای بر بهبود خصوصیات تخمیر و پایداری هوازی سیلاژ بخش هوایی گیاه جروسالم آرتیچوک انجام شد. جهت تهیه سیلاژها، این گیاه با نسبت های صفر، 25، 50 و 75 درصد ذرت علوفه‌ای در سیلوهای آزمایشگاهی با چهار تکرار سیلو شد.کمترین pH (85/3) و بیشترین غلظت اسید لاکتیک (5/48 گرم در کیلوگرم ماده خشک) در سیلاژهای حاوی 75 درصد و پس از آن در سیلاژهای حاوی 50 درصد ذرت علوفه ای مشاهده شد. در سیلاژهای حاوی 50 و 75 درصد ذرت علوفه‌ای کاهش غلظت اسید بوتیریک و نیتروژن آمونیاکی با افزایش جمعیت باکتری‌های اسید لاکتیک و کاهش جمعیت کپک و مخمر همراه بود. بیشترین نسبت اسید لاکتیک به اسید استیک (2/2) در سیلاژهای حاوی 75 درصد ذرت علوفه ای مشاهده شد. سیلاژهای حاوی 50 و 75 درصد ذرت علوفه ای دارای بیشترین پروتئین خام و کربوهیدارت های محلول بود. بیشترین پایداری هوازی در سیلاژهای حاوی 50 درصد ذرت علوفه ای (584 ساعت) با عدم رشد کپک در این سیلاژها همراه بود. نتایج مطالعه حاضر نشان داد، استفاده از 50 درصد ذرت علوفه ای در هنگام تهیه سیلاژ بخش هوایی جروسالم آرتیچوک باعث بهبود تخمیر شد. همچنین، مخلوط نمودن این دو علوفه با سطوح مختلف استفاده شده از ذرت علوفه ای باعث بهبود پایداری هوازی سیلاژها شد و بیشترین پایداری هوازی در سیلاژ حاصل از مخلوط 50:50 این دو علوفه مشاهده شد.
کلیدواژه‌ها
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