برآورد پارامترهای ژنتیکی و فنوتیپی بعضی از صفات تولید‌مثلی بزهای ماده نژاد سیاه بنگالی

Subject Areas : Camel

ام.ام. میا ¹ , ام.آ.ام.ی. خاندوکر ² , اس.اس. هوساین ³ , ام.او. فاروق ⁴ , دی.آر. نوتر ⁵ , M.N. Haque ⁶

1 - Department of Genetics and Animal Breeding, Sylhet Agricultural University, Sylhet, Bangladesh
2 - Department of Genetics and Animal Breeding, Bangladesh Agricultural University, Mymensingh, Bangladesh
3 - Department of Genetics and Animal Breeding, Bangladesh Agricultural University, Mymensingh, Bangladesh
4 - Department of Genetics and Animal Breeding, Bangladesh Agricultural University, Mymensingh, Bangladesh
5 - Department of Animal and Poultry Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 240610306, USA
6 - Department of Genetics and Animal Breeding, Sylhet Agricultural University, Sylhet, Bangladesh

Received: 2012-07-01 Accepted : 2012-12-31 Published : 2013-12-01

Keywords: پارامترهای ژنتیکی, بز ماده سیاه بنگالی, عوامل ثابت, توارث‌پذیری صفات تولیدمثلی,

Abstract :

موضوع این مطالعه ارزیابی پارامترهای ژنتیکی و فنوتیپی برای بعضی از صفات تولید‌مثلی ماده بزهای سیاه بنگالی بود. پارامترهای ژنتیکی توسط رویه حداکثر درست‌نمایی باقی‌مانده‌ها با برازش یک مدل حیوانی بدون در نظر گرفتن ژنتیک مادری و یا اثرات محیطی دایمی برآورد شد. میانگین‌های حداقل مربعات تعداد بزغاله در زمان زایش، تعداد بزغاله در زمان از شیرگیری، وزن در زمان زایش، وزن در زمان از شیرگیری و طول دوره آبستنی به‌ترتیب 5/1، 29/1، 58/1، 37/6 کیلوگرم و 171 روز بود. اثر تعداد زایش بزهای ماده روی تعداد بزغاله‌های متولد ‌شده، تعداد بزغاله‌ها در زمان از شیرگیری، وزن در زمان زایش، و وزن در زمان از شیر‌گیری معنی‌دار بود. در مجموع، تعداد بزغاله در زمان زایش و زمان از شیرگیری و همچنین وزن بزغاله در زمان زایش و زمان از شیرگیری با افزایش تعداد زایش افزایش یافت. اثر فصل زایش روی تعداد بزغاله در زمان از شیرگیری و وزن بزغاله در زمان زایش و زمان از شیرگیری معنی‌دار بود. برآورد توارث‌پذیری برای تعداد بزغاله در زمان زایش، تعداد بزغاله در زمان از شیرگیری، وزن بزغاله در زمان زایش، وزن بزغاله در زمان از شیرگیری و طول دوره آبستنی به‌ترتیب 08/0، 13/0، 1/0، 0/0 و 18/0 بود. تخمین‌های پایین بدست‌آمده برای صفات تولید‌مثلی مشخص می‌نماید که انتخاب بر اساس عملکردهای فردی بزهای ماده ممکن است منجر به پیشرفت ژنتیکی آهسته شود.

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