ارزیابی ژنتیکی برخی از خصوصیات لاشه ارزیابی شده با اولتراسونوگرافی بلادرنگ در گوسفند بلوچی
Subject Areas : Camelع. محمدی 1 , س. حسنی 2 , س. زره داران 3 , م. باقری 4 , ع. میرشاهی 5
1 - Department of Animal and Poultry Breeding and Genetics, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran
2 - دانشگاه علوم کشاورزی و منابع طبیعی گرگان
3 - Department of Animal Science, Ferdowsi University of Mashhad, Mashhad, Iran
4 - Veterinary Clinic, Near Laleh Residential Complex, Asian Highway, Mashhad, Iran
5 - Department of Clinical Science, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
Keywords: پارامترهای ژنتیکی, ضخامت چربی پشت, گوسفند بلوچی, مساحت ماهیچه کمر, اندازه‌گیری‌های اولتراسوند,
Abstract :
در تحقیق حاضر، به منظور ارزیابی خصوصیات لاشه یک گله هسته اصلاح نژادی گوسفند بلوچی از روش اولتراسوند در موجود زنده برای اندازهگیری ضخامت چربی پشت و مساحت ماهیچه کمر و نیز تخمین پارامترهای ژنتیکی برای این صفات اولتراسونیک و اوزان زنده در سنین مختلف استفاده شد. داده‌ها از 576 حیوان در سال 1390 جمع‌آوری شد. اجزاء (کو) واریانس با استفاده از مدلهای حیوانی یک متغیره و دو متغیره با روش حداکثر درستنمایی محدود شده و نرمافزارASREML تخمین زده شدند. حیوانات ماده ضخامت چربی پشت و مساحت ماهیچه کمر بیشتری نسبت به حیوانات نر داشتند. تخمینهای وراثت‌پذیری مستقیم برای ضخامت چربی پشت، مساحت ماهیچه کمر، وزن تولد، وزن شیرگیری، وزن شش ماهگی، وزن نه ماهگی و وزن یکسالگی به ترتیب برابر با 32/0، 23/0، 27/0، 02/0، 12/0، 22/0 و 18/0 بود. همبستگی ژنتیکی (15/0±68/0) و فنوتیپی (03/0±62/0) مثبت و بالایی بین ضخامت چربی پشت و مساحت ماهیچه کمر وجود داشت. همبستگیهای ژنتیکی بین صفات اولتراسونیک و اوزان قبل از شش ماهگی به استثناء وزن تولد و مساحت ناحیه کمر (28/0±39/0) مثبت و پایین بود. برعکس، همبستگیهای ژنتیکی مثبت متوسط تا بالایی بین صفات اولتراسونیک و اوزان شیرگیری و پس از شیرگیری وجود داشت (33/0 تا 61/0). همبستگیهای فنوتیپی بین صفات اولتراسونیک و رشد مثبت و در دامنه 09/0 تا 37/0 متغیر بود. همبستگی ژنتیکی مثبت و بالای بین ضخامت چربی پشت و مساحت ماهیچه کمر نشان می‌دهد که انتخاب برای توده ماهیچه بزرگتر باعث تولید لاشههایی با چربی بیشتر می‌شود.
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