نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ‌ارشد، گروه علوم دام و طیور، پردیس ابوریحان، دانشگاه تهران

2 استادیار، گروه علوم دام و طیور، پردیس ابوریحان، دانشگاه تهران

3 دانشیار، گروه علوم دام و طیور، پردیس ابوریحان، دانشگاه تهران

چکیده

این مطالعه به منظور بررسی اثر منابع مختلف مکمل آلی و معدنی مس بر فراسنجه‌های تولید گاز و قابلیت هضم مواد مغذی در بره‌های نر زندی انجام شد. در آزمایش اول، هجده راس برة نر (میانگین وزن 62/1±53/17 کیلوگرم) در قالب طرحی کاملاً تصادفی در سه گروه شش راسی، در جایگاه‌های انفرادی به مدت هفتاد روز پروار شدند. تیمارها شامل شاهد (جیرة پایة بدون مکمل مس)، جیرة پایه به همراه 10 میلی‌گرم مس در کیلوگرم مادة خشک جیره به شکل پروتئینات و جیرة پایه به همراه 10 میلی‌گرم مس در کیلوگرم مادة خشک جیره به شکل سولفات بود. تغذیة بره‌ها با جیره‌های حاوی مکمل مس میانگین افزایش وزن روزانه و ضریب تبدیل خوراک مصرفی را بهبود بخشید، ولی تأثیری بر مصرف خوراک نداشت. قابلیت هضم مادة خشک، مادة آلی، پروتئین خام و ADF در بره‌هایی که از جیرة مکمل شده با مس آلی تغذیه شدند، نسبت به بره‌های سایر تیمارها بیشتر بود (01/0P<). در آزمایش دوم، میزان انرژی سوخت‌وسازی جیره‌های آزمایش اول برآورد و تأثیر منبع مس بر فراسنجه‌های تولید گاز بررسی شد. نرخ تولید گاز (c) در بین تیمارهای آزمایشی معنادار نبود اما پتانسیل تولید گاز (b) در تیمارهای حاوی مکمل مس بیشتر از تیمار شاهد بود (05/0P<). براساس نتایج تحقیق حاضر، افزودن مکمل مس به شکل آلی به جیرة بره‌های پرواری از طریق بهبود قابلیت هضم مواد مغذی باعث بهبود عملکرد می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of different sources of copper on performance, gas production parameters and nutrients digestibility in Zandi lamb

نویسندگان [English]

  • Nasrin Hoseinpour 1
  • Mohammad Ali Norouzian 2
  • Ahmad Afzalzadeh 3

1 M.Sc. Student, Department of Animal and Poultry Science, College of Abouraihan, University of Tehran, Iran

2 Assistant Professor, Department of Animal and Poultry Science, College of Abouraihan, University of Tehran, Iran

3 Associate Professor, Department of Animal and Poultry Science, College of Abouraihan, University of Tehran, Iran

چکیده [English]

This study was conducted to investigate effect of different sources of copper on gas production parameters and nutrients digestibility in Zandi male lambs. In the first experiment, 18 male lambs (initial body weight 17.53±1.62) divided into three groups and fed one of the three experimental diets for 70 days. Dietary treatments were control (basal diet without copper supplement), basal diet plus 10 ppm copper from sulfate and basal diet plus 10 ppm from proteinate copper. In comparison with control, copper supplementation improved average daily gain and feed conversion ratio, but there was no significant difference among the dietary treatments for dry matter intake. Dry matter, organic matter, crude protein and acid detergent fiber digestibility was higher for lambs fed with organic copper compared to lambs fed with control and inorganic copper (P<0.01). In the second experiment, an in vitro gas production technique was used to evaluate the effects of copper sources on the amount and rate of gas production, dry matter degradability, utilization of metabolizable energy (ME), and ruminal fermentation patterns using rumen fluid from three lambs as inoculum. Rate of gas production (c) did not differ among the treatments. Asymptotic of gas production (b) was higher for diets containing supplemental copper compared to control. It seems that supplementation of fattening lamb diet with of organic copper could be improved rumen fermentation and performance of lambs.

کلیدواژه‌ها [English]

  • digestibility
  • Gas production
  • organic copper
  • performance
  • Zandi lamb

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