بررسی ساختار جامعه و همخونی گوسفند سنگسری

Subject Areas : Camel

م. میرزایی ایلالی ¹ , س. حسنی ² , م. آهنی آذری ³ , ر. عبداله‌پور ⁴ , س. نقویان ⁵

1 - Department of Animal and Poultry Breeding and Genetics, Faculty of Animal Science, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran
2 - دانشگاه علوم کشاورزی و منابع طبیعی گرگان
3 - Department of Animal and Poultry Breeding and Genetics, Faculty of Animal Science, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran
4 - Department of Animal Science, Islamic Azad University, Qaemshahr Branch, Qaemshahr, Iran
5 - Department of Animal and Poultry Breeding and Genetics, Faculty of Animal Science, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran

Received: 2018-12-12 Accepted : 2019-03-02 Published : 2019-12-01

Keywords: تنوع ژنتیکی, همخونی, ساختار جامعه, گوسفند سنگسری,

Abstract :

هدف این مطالعه توصیف همخونی و ساختار جامعه در ایستگاه اصلاح نژاد گوسفند سنگسری بود. به این منظور، داده­های 7028 رأس گوسفند سنگسری که در طول سال‌های 1365 تا 1392 در ایستگاه اصلاح نژاد گوسفند سنگسری واقع در نزدیکی شهر دامغان، استان سمنان جمع‌آوری شده بود، مورد استفاده قرار گرفت. بره‌های متولد شده در سال­های 1388 تا 1392 به عنوان جامعه مرجع درنظر گرفته شدند. آنالیز ساختار ژنتیکی این جامعه با نرم افزار ENDOG نسخه 8/4 انجام شد. میانگین همخونی کل جامعه و جامعه مرجع به ترتیب 28/0 و 70/0 درصد بود. متوسط رابطه خویشاوندی، اندازه جامعه مؤثر تحقق یافته بر اساس افزایش انفرادی در همخونی، تعداد مؤثر بنیان گذاران (fe) و معادل ژنومی حیوانات بنیان‌گذار (fg) به ترتیب 59/0 درصد، 75/148، 140 و 97/49 تخمین زده شد. میانگین فاصله نسلی در جامعه حاضر 24/4 سال و متوسط تعداد نسل های معادل 64/1 تخمین زده شد. متوسط همتباری، تعداد مؤثر اجداد (fa)، متوسط نسل معادل کامل به ترتیب 0005/1 درصد، 76 و 02/3 محاسبه شد. نسبت fe به fa که بیان کننده اثر باتل نک‌های جامعه است، 84/1 بود. پنجاه درصد کل تنوع ژنتیکی مربوط به 32 جد با بالاترین نفوذ بود. با نظارت برپارامترهای مربوط به تنوع ژنتیکی و مدیریت جفتگیری می‌توان از کاهش تنوع ژنتیکی و اثرات مضر احتمالی ناشی از افزایش همخونی جلوگیری نمود.

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