نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار گروه علوم دامی، واحد آزادشهر، دانشگاه آزاد اسلامی، آزادشهر، ایران
2 دانش آموخته کارشناسی ارشد اصلاح نژاد دام، گروه علوم دامی، واحد آزادشهر، دانشگاه آزاد اسلامی، آزادشهر، ایران
چکیده
هدف تحقیق حاضر بررسی اثر ژنتیکی افزایشی بر صفات وزن تخم، وزن زرده و میزان اسیدهای چرب زرده و برآورد توارث‌پذیری این صفات بود. در این پژوهش، از 150 بلدرچین ژاپنی سفید (شامل 50 نر و 100ماده) به عنوان نسل مولد یا پایه (فاقد هرگونه اطلاعات شجرهای) استفاده شد. در نسل F2، 100 بلدرچین ماده در سن 5 هفتگی، به طور تصادفی انتخاب شدند و به قفس‌های تخم‌گذاری انتقال یافتند. صفات مورد مطالعه شامل وزن تخم، وزن زرده و میزان اسیدهای چرب زرده بود. مولفه‌های واریانس و کوواریانس و پارامترهای ژنتیکی صفات با استفاده از مدل حیوانی چند‌صفتی و نرم‌افزار Wombat برآورد گردید. وراثت‌پذیری وزن تخم و وزن زرده به ترتیب 45/0 و 38/0 محاسبه شد. این برآوردها برای اسیدهای چرب زرده از 27/0 (اسید پالمیتولئیک) تا 45/0 (اسید پالمتیک) متغیر بود. همبستگی ژنتیکی بین وزن تخم و اسیدهای چرب زرده، کم و از 01/0 (بین وزن تخم و اسید لینولئیک) تا 10/0 (بین وزن تخم و اسید استئاریک) بود. همبستگی ژنتیکی وزن زرده و مقدار اسیدهای چرب بیشتر و در دامنه‌ای از 10/0 (بین وزن زرده و اسید لینولنیک) تا 51/0 (بین وزن زرده و اسید استئاریک) بود. براساس این نتایج می‌توان پیش‌بینی کرد که انتخاب ژنتیکی در جهت افزایش وزن زرده تخم در بلدرچین، منجر به افزایش مقدار اسیدهای چرب زرده شود.
کلیدواژه‌ها
موضوعات
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