نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد، گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و صنایع غذایی خوزستان، ملاثانی، اهواز، ایزان.
2 دانشیار،دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، عضو هیات علمی، تخصص: غذا و تغذیه دام، اهواز، ایران.
چکیده
این پژوهش با هدف تعیین اثر استفاده از برگ پنج انگشت به‌عنوان جایگزین یونجه در جیره بزغاله‌های نر پرواری بر عملکرد، تخمیر شکمبه‌ای، قابلیت هضم مواد مغذی و بعضی فراسنجه‌‌های خونی انجام شد. تیمارهای آزمایشی شامل ۱- جیره شاهد (فاقد برگ پنج انگشت) و ۲- جایگزینی 60 درصد (معادل ۱۸ درصد کل جیره) برگ پنج انگشت با یونجه در جیره شاهد بود. در این آزمایش از ۱۶ رأس بزغاله نر با میانگین وزن 2±18 کیلوگرم و سن 4/5 ماه در قالب طرح کاملا تصادفی با دو تیمار و هشت تکرار به‌مدت ۶۰ روز استفاده شد. مصرف خوراک، تغییرات وزن در هر ۱۵ روز و ضریب تبدیل خوراک اندازه‌‌گیری و محاسبه شدند. ماده خشک مصرفی، قابلیت هضم مواد مغذی، افزایش وزن روزانه و ضریب تبدیل غذایی کل دوره تحت تأثیر تیمارهای آزمایشی قرار نگرفت. غلظت کلسترول (p=0/07) و نیتروژن اوره‌ای خون (p=0/08) دا‌م‌های تغذیه شده با جیره حاوی برگ پنج انگشت در مقایسه با گروه شاهد تمایل به کاهش و غلظت گلوکز (p=0/08) تمایل به افزایش داشت. غلظت نیتروژن آمونیاکی مایع شکمبه و pH در تیمار حاوی برگ پنج انگشت کاهش معنی‌دار داشت (0/05>P). بنابراین، از برگ گیاه پنج انگشت می‌توان تا ۱۸ درصد در تغذیه بزغاله‌های پرواری به‌عنوان جایگزین مناسبی برای ۶۰ درصد از علوفه یونجه بدون اثر منفی بر قابلیت هضم و عملکرد آنها استفاده کرد.
کلیدواژه‌ها
عنوان مقاله [English]
The effect of feeding vitex agnus-castus leaves on nutrients digestibility and fattening performance of male goat kids
نویسندگان [English]
- Yaghob Nozari 1
- Morteza Chaji 2
1 ِAgricultural Sciences and Natural Resources University of Khuzestan
2 Faculty member (Academic staff) ِAgricultural Sciences and Natural Resources University of Khuzestan
چکیده [English]
The aim of the present experiment was to determine the effect of using the vitex agnus-castus (vitex) leaves as an alternative for alfalfa hay in the diet of fattening male goat kids on the performance, ruminal fermentation, digestibility of the nutrients and some blood parameters. The experimental treatments were 1) control (without vitex) and 2) replacement of vitex leaves with 60% alfalfa hay in the control diet
(equal to 18% of diet). Sixteen fattening male goat kids with the average weights of 18 ± 2 kg and ages of 4.5 months were randomly assigned to the two treatments and eight replications for 60 days. Feed consumption, weight changes and feed conversion ratio were measured every 15 days. Dry matter intake, digestibility of nutrients, daily weight gain and feed conversion ratio were not affected by the
experimental treatments in the entire experiment period. Compared to the control diet, concentrations of blood urea nitrogen (P =0.08) and cholesterol (P =0.07) tend to decrease whereas blood glucose concentration (P=0.08) tend to increase in the kids fed with the diet containing vitex leaves. Ammonia nitrogen concentration and pH of the rumen liquor in treatment containing vitex leaves were significantly lower compared to the control group (P <0.05). Consequently, the vitex leaves can be used up to 18% of diet in the feeding of fattening male goat kids as an appropriate replacement for 60% of alfalfa hay without having the negative effects on their digestion and performance.
کلیدواژه‌ها [English]
- Blood urea nitrogen
- Daily weight gain
- digestibility
- feed conversion ratio
- Ruminal fermentation
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