تاثیر امتیاز وضعیت بدنی میش در زمان جفتگیری بر صفات وزن بدن و تعداد بره در گوسفندان خالص و آمیخته زل

نوع مقاله: مقاله کامل

نویسندگان

1 استادیار گروه علوم دامی، واحدآزادشهر، دانشگاه آزاد اسلامی، آزادشهر، ایران

2 دانشجوی کارشناسی ارشد اصلاح نژاد دام، گروه علوم دامی، واحدآزادشهر، دانشگاه آزاد اسلامی، آزادشهر، ایران

چکیده

هدف از پژوهش حاضر بررسی تاثیر امتیاز وضعیت بدنی میش بر صفات وزن بدن بره و تعداد بره در هر زایش بود. بدین منظور امتیاز وضعیت بدنی 132 راس میش (50 میش آمیخته زل و دالاق و 82 میش زل)، در زمان جفتگیری مورد بررسی قرار گرفت. میش ها در محدوده سنی دو تا چهار سال و دامنه وزنی 5/34 تا 5/63 کیلوگرم قرار داشته و از نظر امتیاز وضعیت بدنی به پنچ گروه با فاصله یک واحد (1 تا 5) تقسیم شدند. میش‌های با امتیاز 3 و 5 به ترتیب بیشترین و کمترین فراوانی را داشتند. در مقایسه گوسفندان زل با آمیخته زل و دالاق، بره‌های آمیخته وزن تولد تا شیرگیری بیشتری را نشان دادند (05/0 > p). درصد دوقلوزایی نیز در گوسفندان آمیخته بیشتر از زل بود (001/0 > p). اثر نمره بدنی میش بر وزن بره‌ها در سنین مختلف و تعداد نتاج در هر زایش، معنی‌دار بود (05/0 > p). بره‌های میش‌هایی با امتیاز بدنی 4 و 5 وزن بدن بیشتری در زمان تولد، یک ماهگی و شیرگیری نشان دادند (05/0 > p). بیشترین درصد دوقلوزایی در میش‌هایی با امتیاز بدنی 3 و بیشتر مشاهده شد (05/0 > p). با توجه به اثر امتیاز وضعیت بدنی میش بر میزان دوقلوزایی و وزن بدن بره‌ها، پیشنهاد می‌شود که به منظور دستیابی به عملکرد تولیدی و تولیدمثلی بهتر در میش‌های نژاد زل حداقل امتیاز وضعیت بدنی 3 در مدیریت گله درنظر گرفته شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The effect of ewe body condition score at mating on lamb body weights and litter size in purebred and crossbred Zel sheep

نویسندگان [English]

  • N. Farzin 1
  • N. Moazezi 2
  • A. Seraj 1
1 Assistant Professor, Department of Animal Science, University of Azad Islamic, Branch Azadshahr, Iran.
2 M.Sc student Department of Animal, University of Azad Islamic, Branch Azadshahr, Iran.
چکیده [English]

The aim of current study was to investigate the effect of ewe’s body condition score on lamb body weights and litter size in Zel sheep. For this purpose, body condition scores of 132 ewes (50 purebred Zel ewes and 82 crossbred of Zel and Dalagh ewes) which ranged from 2 to 4 years and 34.5 to 63.5 kg were used. Body condition scores of ewes were recorded at mating. Ewes were divided into five groups with a distance of 1 unit (from 1 to 5) based on BCS. Ewes with the cores of 3 and 5 had the highest and lowest frequencies in the population, respectively. Purebred and crossbred lambs showed significant differences in body weights (from birth to weaning time) and litter size. Crossbred lambs showed higher weights at the all ages (P<0.05) and more litter size in comparison with purebred lambs. Body condition scores of ewes showed a significant effect on lambs’ body weights and litter size. Lambs of ewes with BCS 4 and 5 showed more body weights from birth to weaning. The highest rate of twinning was recorded in ewes with BCS 3 and higher. These results suggested that ewes with at the least 3 body condition scores had better productive and reproductive performance in Zel breed.

کلیدواژه‌ها [English]

  • Body condition score
  • Body weight
  • litter size
  • Zel breed
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