نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکتری گروه علوم دامی، دانشکدۀ علوم و مهندسی کشاورزی، پردیس کشاورزی و منابع طبیعی کرج، دانشگاه تهران

2 دانشیار گروه علوم دامی، دانشکدۀ علوم و مهندسی کشاورزی، پردیس کشاورزی و منابع طبیعی کرج، دانشگاه تهران

3 استادیار گروه علوم دامی، دانشکدۀ علوم و مهندسی کشاورزی، پردیس کشاورزی و منابع طبیعی کرج، دانشگاه تهران

چکیده

هدف از تحقیق حاضر، ارزیابی اثر جیره‏های گلوکوژنیک مکمل‌شده با اسیدهای چرب غیراشباع متفاوت بر فراسنجه‏های تولیدمثلی میش نژاد ایران‌بلک در دو برنامۀ مدیریتی بود. میش‏ها در دو گروه الف (75 رأس) و ب (25 رأس) قرار گرفتند. میش‏های گروه الف در روزهای 80 و 90 بعد زایش به ‏ترتیب قطع شیر و قوچ‏اندازی شدند. 40 روز قبل از قوچ‏اندازی زیر پوست گوش میش‏ها ایمپلنت ملاتونین قرار داده شد. 75 میش گروه الف در سه گروه 25تایی جدا نگهداری و به ترتیب از جیره‏های گلوکوژنیک مکمل‌شده با چربی اشباع (جیرۀ شاهد)، دانۀ کتان اکسترودشده (جیرۀ امگا 3)، یا دانۀ سویای برشته‌شده (جیرۀ امگا 6) تغذیه شدند. میش‏های گروه ب به‏ ترتیب در روزهای 120 و 180 قطع شیر و قوچ‏اندازی شده و از جیرۀ گروه شاهد تغذیه شدند (به‌عنوان گروه مدیریت سنتی). نرخ فحلی، تخمک‏ریزی، بره‏زایی، و چندقلوزایی در تیمارهای گوناگون آزمایش شمارش و ثبت شد. وزن بره‏ها در زمان زایش، سه، و چهارماهگی اندازه‌گیری شد. نرخ بره‏زایی و چندقلوزایی در تیمارهای امگا 3 و امگا 6 به‌صورت معنی‏داری بیشتر از تیمار شاهد و گروه ب بود. میانگین وزن بره در سه و چهارماهگی در گروه ب به‌طور معنی‏داری بیشتر از همۀ تیمارهای گروه الف بود. بنابراین استفاده از برنامۀ مدیریتی گروه الف همراه با تغذیۀ اسیدهای چرب امگا 3 و امگا 6 می‏تواند سبب بهبود عملکرد فراسنجه‏های تولیدمثلی میش‏ها شود. 

کلیدواژه‌ها

عنوان مقاله [English]

The effect of glycogenic diets complemented with different poly unsaturated fatty acids on reproductive performance in ewe

نویسندگان [English]

  • Hamed Kermani Moakhar 1
  • Armin Towhidi 2
  • Saeed Zeinoldini 2
  • Hamid Kohram 3

1 Ph.D., Department of Animal Science, Faculty of Agricultural Science and Engineering, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

2 Associate Professor, Department of Animal Science, Faculty of Agricultural Science and Engineering, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

3 Assistant Professor, Department of Animal Science, Faculty of Agricultural Science and Engineering, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

چکیده [English]

The aim of this study was to evaluate the effect of glycogenic diets supplemented with different poly unsaturated fatty acids on reproductive performance of Iran Black ewes in two different managing programs. Ewes were allocated in two different groups; group A (n = 75) and group B (n = 25). Ewes from group A were stopped from suckling followed by introducing to the rams on days 80 and 90, respectively. Melatonin implant was laid under the skins ear of these ewes 40 days before introducing them to the rams. Animals from group A were divided into three groups (25 ewes/sub-group) and were fed by high starch diets supplemented with saturated fatty acids (control diet), extruded linseed (omega 3 diet), and full fat soybean (omega 6 diet). Ewes from group B were stopped from suckling on day 120, introduced to the rams on day 180 after parturition and fed as described for the control diet. Data for the rates of Estrus cycle, ovulation, lambing and twining were recorded for each group. The weight of lambs was measured at the birth time of birth, and also at 3 and 4 months of age. The lambing and twining rates were higher in omega 3 and omega 6 diets as compared with the control diet and group B. Animals in group B indicated a higher lamb weight at 3 and 4 months of age compared to all treatments in group A. In conclusion, data from current study suggested that using management program of group A along with feeding omega 3 and 6 could improve the reproductive performance of Iran Black ewes. 

کلیدواژه‌ها [English]

  • cutting milk
  • Fatty acid
  • melatonin
  • sheep
  • reproductive performance

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