استنباط بیزی مولفه‌های واریانس–کواریانس و پارامترهای ژنتیکی برای صفات اقتصادی هلشتاین‌های ایران از طریق نمونه‌گیری گیبس

Subject Areas : Camel

H. Faraji-Arough ¹ , A.A. Aslaminejad ² , M. Tahmoorespur ³ , M. Rokouei ⁴ , M.M. Shariati ⁵

1 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
2 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
3 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
4 - Department of Animal Science, Faculty of Agriculture, University of Zabol, Zabol, Iran
5 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran

Received: 2014-01-12 Accepted : 2014-04-30 Published : 2015-03-01

Keywords: صفات تولیدی, نمره سلول‌های بدنی, استنباط بیزی, صفات تولید‌مثلی,

Abstract :

هدف از این مطالعه، برآورد پارامترهای ژنتیکی صفات تولید، تولید مثل و بهداشت گاوهای هلشتاین ایران با استفاده از روش بیزی از طریق نمونه­گیری گیبس بود. رکوردهای اولین شیردهی 320666 گاو هلشتاین متولد شده از 7696 نر و 260302 ماده که مابین سال‌های 1370 تا 1389 توسط مرکز اصلاح نژاد دام کشور جمع­آوری شده بود، مورد استفاده قرار گرفت. مولفه­های واریانس- کواریانس با استفاده از مدل حیوانی چند صفتی از طریق نمونه‌گیری گیبس برآورد شدند. بعد از رسیدن به همگرایی، دامنه تراکم پسین وراثت­پذیری برای شیر (MY305)، چربی (FY305)، پروتئین (PY305)، سن در اولین گوساله ­زایی (AFC)، فاصله گوساله ­زایی (CI) و نمره سلول‌های بدنی (SCS) به ترتیب 275/0-255/0، 215/0-195/0، 225/0-195/0، 275/0-260/0، 080/0-065/0 و 075/0-055/0 بود. دامنه همبستگی ژنتیکی بین 121/0- (بین تولید چربی و سن در اولین گوساله زایی) تا 914/0 (بین تولید شیر و پروتئین) و همبستگی فنوتیپبی بین 083/0- (بین تولید شیر و نمره سلول‌های بدنی) تا 929/0 (بین تولید شیر و پروتئین) به دست آمد. نتایج این مطالعه نشان داد که صفات تولیدی و سن در اولین گوساله زایی تنوع ژنتیکی کافی برای بهبود در برنامه­های اصلاحی را دارند. همبستگی­های ژنتیکی برآورد شده پیشنهاد کننده این هستند که صفات تولید شیر و فاصله گوساله ­زایی در صورتی که افزایش تولید شیر در اهداف انتخابی مد نظر قرار گیرد می­توانند تحت تأثیر قرار بگیرند. همبستگی ژنتیکی بالا بین فاصله گوساله­ زایی و نمره سلول‌های بدنی بیان کننده این است که افزایش فاصله گوساله ­زایی منجر به افزایش نمره سلول‌های بدنی می­شود.

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