نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری گروه تغدیه دام و طیور، دانشکده علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، گلستان
2 استاد گروه تغذیه دام و طیور، دانشکده علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
3 استادیار موسسه تحقیقات علوم دامی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج
چکیده
این پژوهش با هدف بررسی تاثیر استفاده از سطوح مختلف ضایعات چای سبز بر عملکرد رشد، قابلیت هضم مواد مغذی وتعادل نیتروژن برههای پرواری انجام گرفت. بدین منظور از چهار تیمار آزمایشی دارای سطوح صفر، 2، 4 و 6 درصد ماده خشک ضایعات چای سبز استفاده گردید. مقدار وزن پایانی، افزایش وزن روزانه و ضریب تبدیل بین تیمارهای دارای 2، 4 و 6 درصد ضایعات چای سبز معنی‌دار شد (05/0 P<)، اما تفاوت معنی‌داری بین تیمار دارای 2 درصد ضایعات چای سبز و شاهد در رابطه با عملکرد وجود نداشت. تیمار دارای 2 درصد ضایعات چای بالاترین مقدار قابلیت هضم پروتئین خام را به خود اختصاص داد (05/0 P<). قابلیت هضم ماده خشک و ماده آلی تیمار 2 درصد ضایعات چای سبز اختلاف معنی‌داری با تیمار شاهد نداشت اما از سایر تیمارهای آزمایشی به‌طور قابل توجهی بیشتر بود (05/0 P<). ابقای نیتروژن در تیمار دارای 2 درصد ضایعات چای سبز با تیمار شاهد از لحاظ آماری اختلاف معنی‌داری نداشت اما نسبت به سایر تیمارهای مورد بررسی به‌طور معنی‌داری بیشتر بود (05/0 P<). مقدار نیتروژن آمونیاکی مایع شکمبه در تیمارهای دارای ضایعات چای سبز به‌طور معنی‌داری از تیمار شاهد کمتر بود (05/0 P<). استفاده از ضایعات چای سبز نسبت به تیمار شاهد به‌طور قابل توجهی موجب کاهش غلظت نیتروژن اوره‌ای خون گردید (05/0 P<). با توجه به نتایج حاصل، افزودن ضایعات چای سبز در سطح 2 درصد ماده خشک در جیره برههای پرواری موجب بهبود قابلیت هضم و تعادل نیتروژن و در نهایت بهبود عملکرد در برههای پرواری نژاد شال شد.
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