Gene Dropping Analysis of Founder Contributions and Allelic Diversity in an under Selected Population of Japanese Quails
محورهای موضوعی : Camel
1 - Department of Animal Science, Faculty of Agriculture, Lorestan University, Khorram-Abad, Iran
2 - Department of Animal Science, Faculty of Agricultural Science, Payame Noor University, Tehran, Iran
کلید واژه: genetic diversity, Japanese quail, founder, gene dropping,
چکیده مقاله :
The current study was conducted to consider how pedigree and the gene-dropping analysis can use to monitor genetic diversity, and to recommend a breeding strategy for improving breast weight (BRW) in a population of Japanese quail. A total of 312 birds were divided equally into two lines. One line (S1) was selected for four-week body weight (BW) based on breeding value, and the other (S2) was selected for four-week BRW based on between-family selection. The distributions of allele frequencies originating from the founders were estimated using gene-dropping simulation software for the actual pedigree of each line. The results revealed that the total net genetic improvements in BW and BRW in the S1 and S2 lines were 28.3 and 9.7 g vs. 23.3 and 6.8 g, respectively. The average numbers of surviving alleles in the descendants were 59.6 and 31.2 for the S1 and S2 lines, respectively, which were 19.1% and 10% of the total number of assigned alleles in the base population. It can be concluded that for stabilizing the response to selection for improving BRW, it is recommended to use indirect selection of BW based on breeding values. The results obtained from the gene-dropping experiment showed that the between-family selection method results neither in more genetic gain nor in greater remaining genetic variation.
این مطالعه برای بررسی آنالیز شجره و دراپ ژنی جهت نمایش تنوع ژنتیکی و توصیه یک استراتژی انتخاب برای بهبود وزن سینه در یک جمعیت بلدرچین ژاپنی انجام شد. تعداد 312 پرنده به دو گروه مساوی تقسیم شدند. یک لاین (S1) برای وزن چهار هفتگی بدن بر اساس ارزش‌های اصلاحی و دیگری (S2) برای وزن سینه در چهار هفتگی بر اساس انتخاب بین خانوادگی، انتخاب شدند. توزیع فراوانی‌های آللی حاصل از بنیانگذاران با استفاده از شجره هر لاین در نرم افزار شبیه‌ساز دراپ ژنی تخمین زده شد. نتایج نشان داد بهبود ژنتیکی خالص برای وزن بدن و وزن سینه در لاین‌های S1 و S2 به ترتیب 3/28 و 7/9 گرم در مقابل 3/23 و 8/6 گرم بود. میانگین تعداد آلل‌های باقیمانده برای آخرین نسل لاین‌های S1 و S2به ترتیب 6/59 و 2/31 بود که به ترتیب 1/19 و 10 درصد کل آلل‌های اختصاص یافته به جمعیت پایه هر لاین بود. می‌توان نتیجه‌گیری نمود که برای تداوم پاسخ به انتخاب جهت بهبود وزن سینه، انتخاب غیر مستقیم وزن بدن بر اساس ارزش‌های اصلاحی قابل توصیه است. نتایج حاصل از آنالیز دراپ ژنی آشکار نمود که در این تحقیق انتخاب بین خانوادگی پیشرفت ژنتیکی بیشتر و تنوع ژنتیکی باقیمانده بیشتری نسبت به انتخاب انفرادی بر اساس ارزش‌های اصلاحی ندارد.
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