نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجو دکتری، گروه علوم دامی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران

2 استاد گروه علوم دامی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران

3 دانشیار گروه علوم دامی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران

چکیده

هدف از این تحقیق، بررسی اثر تغذیۀ علوفۀ سالیکورنیا بیگلوی بر عملکرد رشد و لاشۀ بره‌های پرواری بود. آزمایش با استفاده از 63 رأس برة نر افشاری در قالب طرح کاملاً تصادفی با هفت تیمار و نه تکرار طی 100 روز انجام شد. تیمارها عبارت بودند از: جیرۀ بدون سالیکورنیا (شاهد) و جیره‌های حاوی 45، 90، 135، 180، 225 و 270 گرم سالیکورنیا به جای یونجه در کیلوگرم مادۀ خشک جیره. سالیکورنیا نسبت به یونجه حاوی مقادیر کمتری پروتئین، نیترات و فیبر شوینده خنثی (NDF) بود، اما مقادیر بیشتری خاکستر، سدیم، اگزالات و ترکیبات فنولی داشت. تغذیۀ سطوح افزایشی سالیکورنیا موجب افزایش خطی مصرف روزانۀ آب شد (05/0>P). مصرف روزانۀ ماده خشک با افزایش سالیکورنیا بیشتر شد (05/0=P)، اما مصرف ماده آلی و پروتئین خام تغییر نکرد. تغذیۀ سالیکورنیا اثر معنی‌داری بر رشد روزانه و ضریب تبدیل بر اساس مادۀ آلی جیره نداشت، اما در سطوح 135 گرم و بیشتر، موجب افزایش ضریب تبدیل بر اساس مادۀ خشک جیره شد. ضرایب هضم ماده خشک (072/0=P) و خاکستر (012/0=P) با افزایش مصرف سالیکورنیا روند افزایشی، و قابلیت هضم NDF روند کاهشی (048/0=P) نشان داد، اما قابلیت هضم مادۀ آلی، پروتئین خام و عصارۀ اتری و بازدۀ لاشه تغییری نداشت. درمجموع، تغذیۀ علوفۀ سالیکورنیا تا 270 گرم در کیلوگرم ماده خشک جیره (با نسبت علوفه به کنسانترۀ 30 به 70) موجب افزایش مصرف آب حیوانات شد، اما اثر منفی بر عملکرد بره‌های پرواری نداشت و می‌توان آن را به‌عنوان جایگزین بخشی از علوفۀ جیره در گوسفندان نر افشاری توصیه نمود.

کلیدواژه‌ها

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