نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار مرکز تحقیقات کشاورزی و منابع طبیعی مشهد، تخصص: ژنتیک و اصلاح دام/ ژنتیک کمی

2 کارشناسی ارشد علوم دامی جهاد کشاورزی خراسان رضوی

3 کارشناسی ارشد علوم دامی جهاد کشاورزی خراسان شمالی

4 دانشجوی دکتری، گروه علوم دامی ف دانشکده کشاورزی، دانشگاه زابل، زابل، ایران

چکیده

هدف از پژوهش حاضر، بررسی اثرات آمیخته‌گری بر عملکرد رشد و ترکیب لاشه بره‌های گوسفند نژاد کردی و آمیخته کردی× رومانف بود. بدین منظور از دو گروه ژنتیکی بره نژاد کردی خالص (KK) و بره آمیخته‌های کردی × رومانف (KR) استفاده شد. از شش بره از هر گروه برای تجزیه لاشه استفاده شد. تعداد بره‌های از شیر گرفته شده در گروه‌های ژنتیکی KK و KR به ترتیب 95 و 45 رأس به ازای 100 راس میش در معرض آمیزش بود. بره‌های کردی خالص دارای بیشترین و بره‌های آمیخته دارای کمترین وزن تولد بودند (به ترتیب 4/5 در مقابل 4/1 کیلوگرم). بر اساس نتایج حاصل، افزایش وزن روزانه بره‌های آمیخته نسبت به بره‌های کردی در دوره قبل از شیرگیری بیشتر بود (0/05>P). اما میانگین وزن پایانی بره‌های کردی نسبت به بره‌های آمیخته (به ترتیب54/8 در مقابل 41/5 کیلوگرم) بیشتر بود (0/05>P). گروه‌های ژنتیکی تأثیر معنی‌داری بر وزن لاشه‌های گرم و سرد بره‌های پرواری نداشتند. ولی تأثیر آمیخته‌گری بر ضخامت چربی، وزن دنبه و ران معنی‌دار بود (0/05>P). نتایج حاصل از این مطالعه نشان داد آمیخته‌ها در دوره قبل از شیرگیری عملکردی بهتری نسبت بره‌های خالص دارند اما در دوره پروار عملکرد بره‌های کردی خالص نسبت به آمیخته‌ها بهتر می‌باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of growth performance and carcass characteristics in purebred Kurdi and Kurdi × Romanov lambs

نویسندگان [English]

  • Davoud Ali Saghi 1
  • Ali Mobaraki 2
  • Mohammad Robati Baluch 3
  • Razieh Saghi 4

1 Khorasan Razavi Agricultural and Natural Resources Research and Education Center AREEO, Mashhad, Iran

2 MSC Animal science. Agriculture Organization of Khorasan Razavi

3 MSC Animal science. Agriculture Organization of North Khorasan.

4 Phd Student

چکیده [English]

The aim of this study was to evaluate the effect of crossbreeding on growth performance and carcass composition of purebred and crossbred Kurdi
lambs. Thus, two genetic groups including purebred Kurdi lambs (KK) and crossbred Kurdi*Romanov lambs (KR) were used. For analysis of carcass
traits, six lambs from each group were selected and slaughtered. The number of weaned lambs for KK and KR were 95 and 45, respectively. Our
results indicated thatKK purebred lambs had the highest (4.5 kg) and KR crossbred lambs had the lowest (4.1 kg) birth weight (P < 0.05). Crossbred
Kurdi*Romanov lambs had higher average daily gain than KK purebred lambs (P < 0.05). The means of final weights of purebred lambs were
significantly higher than crossbred lambs (54.8 vs. 41.5 kg, respectively). The genetic groups had no significant effect on cold and hot carcass weights.
The effect of crossbreeding on fat thickness, fat-tail and leg was significant (P < 0.05). Crossbred lambs performed better than purebred lambs in the
pre-weaning period, but purebred Kurdi lambs performed better than crossbred lambs in the fattening period. In general, it can be reported that the
crossbreeding of Kurdi sheep with Romanov sheep did not show the desireble results.

کلیدواژه‌ها [English]

  • Carcass compositions
  • Crossbreeding
  • Growth
  • Kurdi sheep
  • Romanonv sheep
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