دوره 8، شماره 17 - ( پاییز 1396 )                   جلد 8 شماره 17 صفحات 157-165 | برگشت به فهرست نسخه ها

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Genetic and Non-Genetic Factors Affecting Longevity of Mehraban Sheep. rap. 2018; 8 (17) :157-165
URL: http://rap.sanru.ac.ir/article-1-857-fa.html
رمضانی اکبرآباد سپیده، قوی حسین زاده نوید. بررسی اثر عوامل ژنتیکی و غیرژنتیکی بر طول عمر گوسفندان مهربان . پژوهشهاي توليدات دامي. 1396; 8 (17) :157-165

URL: http://rap.sanru.ac.ir/article-1-857-fa.html

چکیده:   (1851 مشاهده)
در این پژوهش از رکوردهای طول عمر 26991 راس بره حاصل از 405 راس قوچ و 8114 راس میش نژاد مهربان که طی
سال­های 1360 تا 1390 به­وسیله سازمان جهاد کشاورزی استان همدان جمع­آوری شده بود، استفاده شد.
به منظور تعیین عوامل ثابت برازش شده در مدل آماری (سال تولد، ماه تولد، تیپ تولد، سن مادر، اثر گله، جنس بره و متغیر کمکی وزن تولد بره و اثرات متقابل بین آنها) از رویه GLM نرم­افزار SAS استفاده شد. اثر متقابل سال تولد-جنس بره و تمامی اثرات ثابت به جز نوع تولد، سن مادر و متغیر کمکی وزن تولد بره به صورت خطی بر طول عمر معنی­دار (001/0P< ) بودند. جهت برآورد پارامترهای ژنتیکی صفت طول عمر از روش بیزی با استفاده از نمونه­گیری گیبس و نرم­افزار TM1 استفاده شد. برای تمام تجزیه­های بیزی  از 500000 نمونه، با دوره­ی گرم کردن 100000 و با فواصل 100 از یکدیگر استفاده شد. میانگین وراثت­پذیری مستقیم و مادری طول عمر در تجزیه­های مختلف به ترتیب بین 16/0 تا 22/0 و بین 13/0 تا 15/0 برآورد شدند. میانگین همبستگی بین اثر ژنتیکی افزایشی مستقیم با اثر ژنتیکی مادری 54/0- تا 61/0- بدست آمد .با توجه به برآورد پایین وراثت­پذیری صفت طول عمر، می­توان نتیجه گرفت، به منظور افزایش طول عمر، باید با بهبود شرایط محیطی و تصمیمات کاربردی و مدیریتی، طول عمر بره­ها را افزایش داد
متن کامل [PDF 1954 kb]   (1876 دریافت)    
نوع مطالعه: پژوهشي | موضوع مقاله: تخصصي
دریافت: 1396/10/20 | ویرایش نهایی: 1396/11/8 | پذیرش: 1396/10/20 | انتشار: 1396/10/20

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