فراسنجه‌های ژنتیکی و فنوتیپی برای خصوصیات منی و رابطه آن با حاشیه اسکروتومی در بز نر سیاه بنگال
Subject Areas : Camel
ام.ام. میا
1
(Department of Genetics and Animal Breeding, Sylhet Agricultural University, Sylhet, Bangladesh)
ام.آ.ام.ی. خاندوکر
2
(Department of Animal Breeding and Genetics, Bangladesh Agricultural University, Mymensingh, Bangladesh)
اس.اس. هوساین
3
(Department of Animal Breeding and Genetics, Bangladesh Agricultural University, Mymensingh, Bangladesh)
ام.او. فاروق
4
(Department of Animal Breeding and Genetics, Bangladesh Agricultural University, Mymensingh, Bangladesh)
دی.آر. نوتر
5
(Department of Animal and Poultry Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 240610306, USA)
Keywords: منی, پارامترهای ژنتیکی, بز سیاه بنگال, فاکتور‌های ثابت, محیط بیضه,
Abstract :
بز سیاه بنگال از ذخایر ژنتیکی و یکی از پتانسیل‌های ژنتیکی بنگلادش است. فراسنجه‌های ژنتیکی و فنوتیپی برای خصوصیات منی و رابطه آن با محیط بیضه در بز نر سیاه بنگال در این آزمایش برآورد شد. فراسنجه‌های ژنتیکی توسط روش حداکثر درست‌نمایی باقی‌مانده برآورد شدند و مدل حیوانی که اثرات ژنتیک مادری یا اثرات محیطی دایمی را نادیده می‌گرفت برازش شد. میانگین‌های حداقل مربعات حجم منی (میلی‌لیتر در هر انزال)، غلظت اسپرم (109 سلول در میلی‌لیتر)، تحرک توده (درصد)، زنده‌مانی اسپرم (درصد) و اسپرماتوزوآی طبیعی (درصد) به‌ترتیب 56/0، 55/2، 7/79 و 5/90 بود. فصل جمع‌آوری و محیط بیضه به‌طور معنی‌داری بر تمامی خصوصیات مطالعه شده اسپرم موثر بودند. سن بزهای نر بر تمامی خصوصیات مطالعه شده اسپرم به‌جز تحرک توده موثر بود. وزن‌ب دن اثر معنی‌داری بر حجم منی و تحرک توده داشت. برآورد وراثت‌پذیری برای غلظت اسپرم (38/0) متوسط و برای حجم منی، تحرک توده، زنده‌مانی اسپرم و اسپرماتوزوآی طبیعی (05/0 تا 18/0) کم بود. همبستگی فنوتیپی در دامنه اندکی منفی (001/0-) تا مثبت (42/0) و همبستگی ژنتیکی در دامنه متوسط منفی (37/0-) تا خیلی مثبت (99/0) بود. غلظت اسپرم تنها صفت بز سیاه بنگال است که ممکن است طی انتخاب، پیشرفت ژنتیکی منطقی داشته باشد. انتخاب برای افزایش محیط بیضه باید پاسخ مرتبط مطلوبی با خصوصیات منی داشته باشد.
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