نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانش آموخته کارشناسی ارشد، گروه علوم دامی، دانشکده کشاورزی،دانشگاه رازی، کرمانشاه، ایران
2 دانشیار، گروه علوم دامی، دانشکده کشاورزی،دانشگاه رازی، کرمانشاه، ایران
چکیده
به منظور ارزیابی تأثیر کبالت بر عملکرد، برخی فراسنجه‌های خونی و تخمیر، آزمایشی با استفاده از 24 رأس بره نر سه تا چهار ماهه با میانگین وزن 30 کیلوگرم در قالب یک طرح کاملاً تصادفی با چهار تیمار و شش تکرار انجام شد. تیمارهای آزمایشی شامل: جیره پایه (شاهد؛ حاوی 0/083 میلی‌گرم در کیلوگرم کبالت)؛ جیره پایه + 0/2 میلی گرم در کیلوگرم کبالت؛ جیره پایه + 0/4 میلی گرم در کیلوگرم کبالت و جیره پایه + 0/6 میلی گرم در کیلوگرم کبالت بودند. به منظور تعیین فراسنجه‌های خون در روزهای صفر، 45 و70 از سیاهرگ وداج خون‌گیری و برای بررسی فراسنجه‌های تخمیر شکمبه‌ای از طریق مری، مایع شکمبه گرفته شد. مکمل کبالت تأثیر معنی‌داری بر میزان افزایش وزن روزانه، ماده خشک مصرفی و ضریب تبدیل خوراک، میزان ویتامین B12 ، کلسترول، تری‌گلیسیرید، آلبومین سرم خون و همچنین غلظت‌های آلکالین فسفاتاز و آلانین ترانس آمیناز نداشت. غلظت آمونیاک مایع شکمبه در سطح 0/2 و 0/4 مکمل افزایش یافت (0/05>P) ولی غلظت اسیدهای چرب فرار، pH شکمبه و جمعیت پروتوزوآیی شکمبه تغییری نکرد. غلظت‌های کبالت، آهن، روی و مس پلاسما تحت تاثیر تیمارها قرار نگرفت. نتایج حاصل از تحقیق حاضر نشان داد افزودن مکمل کبالت به جیره تا سطح 0/6 با وجود تغییرات محدود در برخی فراسنجه‌های خونی و شکمبه‌ای اثر معنی‌داری بر عملکرد بره‌ها نداشت؛ به نظر می‌رسد که کبالت موجود در جیره پایه برای نیاز کبالت بره‌های در حال رشد سنجابی کافی می‌باشد.
کلیدواژه‌ها
عنوان مقاله [English]
Assessment of different cobalt concentrations in the diet of fattening lambs: Effect on performance, some blood metabolites and rumen fermentation parameters
نویسندگان [English]
- Elham Nadri 1
- Fardin Hozhabri 2
- Mohammad Mehdi Moeini 2
1 Animal Science Department, Razi University, Kermanshah, Iran
2 عضو هیات علمی گروه علوم دامی
چکیده [English]
In order to evaluate the effect of cobalt on performance, some blood and ruminal fermentation parameters an experiment was performed using 24 three to four months old male lambs, with an average weight of 30 kg in a completely randomized design with four treatments and six replications. The experimental treatments consisted of: basic diet (control; containing 0.083 mg cobalt /kg DM); basal diet + 0.2 mg Cobalt /kg DM, basal diet + 0.4 mg cobalt /kg DM, and basal diet + 0.6 mg / kg of cobalt. In order to determine blood parameters on days 0, 45, 70, blood samples were collected from jugular vein and ruminal fluid through the esophagus were taken to evaluate ruminal fermentation parameters. Cobalt supplement had no significant effect on daily gain, dry matter intake, feed conversion ratio, serum B12, cholesterol, triglyceride and albumin and also alkaline phosphatase and alanine transaminase. Ruminal ammonia concentration increased at the level of 0.2 and 0.4 (P<0.05), but concentration of volatile fatty acids, rumen pH and protozoan population did not influence. The concentrations of cobalt, iron, zinc and copper minerals were not affected by treatments. The results of the present study showed that adding cobalt supplementation to the diet up to the level of 0.6, despite limited changes in some blood and ruminal parameters did not have a significant effect on the performance of lambs; it seems that the cobalt in the basic diet could be sufficient for the cobalt requirements of growing Sanjabi lambs.
کلیدواژه‌ها [English]
- alanine transaminase
- alkaline phosphatase
- protozoa
- serum protein
- vitamin B12
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