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اثر سطوح مختلف سلنیوم به‌صورت بلوس آهسته‌رهش قبل از جفت‌گیری بر عملکرد و برخی ‏فراسنجه‌های خونی میش‌های لری بختیاری ‏

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، گروه علوم دامی، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان

2 دانشیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان

3 استادیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه لرستان

چکیده

به منظور بررسی کارایی بلوس آهسته‌رهش حاوی سطوح مختلف سلنیوم بر عملکرد و برخی فراسنجه‌های خونی و شیر میش‌های لری بختیاری، آزمایش حاضر طراحی شد. به این منظور 45 راس میش به سه گروه 15 راسی تقسیم شدند. تیمارها شامل 1) میش‌های شاهد 2) میش‌های دریافت‌کننده 2/0 میلی‌گرم سلنیوم در روز و 3) میش‌های دریافت‌کننده 4/0 میلی‌گرم سلنیوم در روز. در روز اول آزمایش تمامی میش‌ها سیدرگذاری شدند و به گروه‌های مختلف بلوس مورد نظر خورانده شد. در طول دوره تغذیه میش‌ها به‌صورت چرای آزاد روی مرتع بود. نمونه­گیری از خون تمامی میش‌ها در 76 روز پس از قوچ اندازی (اواسط آبستنی) و 30 روز پس از زایمان قبل از رفتن به مرتع صورت گرفت. نتایج نشان داد که وزن تولد، وزن دو ماهگی، افزایش وزن روزانه، تولید شیر، مقدار چربی، پروتئین، مواد جامد بدون چربی و میزان سلنیوم شیر در تیمارهای دریافت‌کننده سلنیوم نسبت به تیمار شاهد بالاتر بود (05/0>P). تولید شیر میش‌های دریافت‌کننده سطح 4/0 میلی‌گرم سلنیوم در روز نسبت به سطح 2/0 میلی‌گرم سلنیوم در روز بالاتر بود (05/0>P). غلظت سلنیوم و تری‌یدوتیرونین سرم و فعالیت گلوتاتیون پراکسیداز خون میش‌های دریافت‌کننده سطوح مختلف سلنیوم نسبت به گروه شاهد بالاتر بود (05/0>P). به‌طورکلی، هر دو سطح  سلنیوم سبب بهبود عملکرد بره‌های متولد شده و برخی فراسنجه‌های خون و شیر میش‌ها شد، اما استفاده از سطح 4/0 میلی‌گرم سلنیوم در روز به خاطر تولید شیر بالاتر توصیه می‌شود. 

کلیدواژه‌ها


عنوان مقاله [English]

Influence of different levels of selenium as a slow release bolus pre-mating on ‎performance and some blood metabolites of Lori Bakhtiari ewes

نویسندگان [English]

  • Morvarid Imani 1
  • Hassan Aliarabi 2
  • Daryoush Alipour 2
  • Amir Fadayifar 3
1 Former M.Sc. Student , Animal Science Department, Faculty of Agriculture, Bu-Ali Sina University, ‎Hamedan, Iran
2 Associate Professor, Animal Science Department, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran
3 Assistant Professor, Animal Science Department, Faculty of Agriculture, Lorestan University, Khorramabad, Iran ‎
چکیده [English]

The present experiment was designed to evaluate the efficiency of the slow-release bolus containing different selenium levels on performance and some blood and milk parameters of Lori Bakhtiari ewes. For this purpose, 45 ewes were divided into three groups (15 in each). Treatments were: 1) control ewes; 2) ewes receiving 0.2 milligrams of selenium per day; and 3) ewes receiving 0.4 mg selenium per day. On the first day of the experiment, all ewes received CIDR and the boluses were fed to the different groups on the same day. During the feeding period the ewes were grazed on the pasture. Blood samples collected from all ewes at 76 days post-mating (mid-gestation) and 30 days postpartum before going to rangeland. The results showed that birth weight, weight at two months of age, average daily gain, milk production, fat content, protein content, non-fat solids content in milk and milk selenium concentration were higher in the groups receiving selenium than the control (P<0.05). Milk production of ewes receiving 0.4 mg selenium per day was higher than those of receiving 0.2 mg selenium per day (P <0.05). Serum selenium and triiodothyronine concentration and blood glutathione peroxidase activity in ewes receiving different levels of selenium were higher than those of control (P<0.05). Overall, both levels of selenium improved the performance of the lambs and some of the blood and milk parameters of the ewes, but the use of 0.40 mg Se/day due to higher milk production is recommended.

کلیدواژه‌ها [English]

  • Glutathione peroxidase
  • Milk
  • slow-release boluses
  • triiodothyronine
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