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محبوبه کرد محمدرضا محمدآبادی علی اسمعیلی زاده کشکوئیه ارسلان برازنده

چکیده

در اﻳﻦ مطالعه از رﻛﻮرد­ﻫﺎي ﻃﻮل ﻋﻤﺮ 772 رأس میش داشتی اﻳﺴﺘﮕﺎه ﭘﺮورش و اﺻﻼح ﻧﮋاد گوسفند کرمانی واﻗﻊ در شهرستان شهربابک استان کرمان که ﻃﻲ ﺳﺎل­ﻫﺎي 1368 ﺗﺎ 1387 ﺟﻤﻊ­آوري ﺷﺪه بودند، استفاده شد. توزیع فراوانی علل حذف و تابع توزیع زنده­مانی میش­ها با استفاده از نرم افزار R پیش بینی شد. همچنین، از مدل ویبال و نرم افزار Matvec برای پیش­بینی اجزای واریانس و فراسنجه­های ژنتیکی صفت طول عمر به عنوان بقاء، استفاده شد. متوسط طول عمر تولیدی میش­ها در این مطالعه 72/4 سال به دست آمد که به­­طور متوسط 4/3 بره در طول عمر خود داشته­اند. بیماری بالاترین علت حذف میش­ها (53 درصد) را به خود اختصاص داد. پس از بیماری به ترتیب پیری، مشکلات باروری، تولید پایین شیر، مشکلات پستانی، کشتار آزمایشی، حادثه فیزیکی و در آخر تیپ نامناسب (5/0 درصد) بیشترین درصد حذف میش­ها را شامل شدند. با افزایش سن احتمال شرطی تلفات روند افزایشی را نشان داد، ولی برعکس آن میزان زنده­مانی تجمعی روند کاهشی نشان داد. نسبت خطر مرگ تا سن چهار سالگی به طور جزئی، ولی بعد از آن به شدت افزایش نشان داد. وراﺛﺖ­ﭘﺬﻳﺮي­ﻫﺎ در ﻣﻘﻴﺎس ﻟﮕﺎرﻳﺘﻤﻲ، ﻣﻘﻴـﺎس اوﻟﻴـﻪ و وراﺛـﺖ­ﭘـﺬﻳﺮي ﻣـﻮﺛﺮ ﻧﺴﺒﺖ ﺧﻄﺮ ﺣﺎﺻﻞ ﺷﺪه از ﻣﺪل ﭘﺪري و داراي ﺗـﺎﺑﻊ وﻳﺒـﺎل در ﺣـﺪ کم به ﺑـﺎﻻ (002/0 تا 145/0) پیش بینی شدند. نتایج حاصله بیانگر آن است که جهت افزایش  طول عمر و زنده مانی میش­ها باید علاوه بر بهبود شرایط محیطی و بهداشتی و تصمیمات مدیریتی و کاربردی به اصلاح ژنتیکی نیز اهتمام ورزید.

جزئیات مقاله

کلمات کلیدی

طول عمر اقتصادی, علل حذف, میش کرمانی

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ارجاع به مقاله
کردم., محمدآبادیم., اسمعیلی زاده کشکوئیهع., & برازندها. (2019). مطالعه تغییرات، پیش¬بینی مؤلفه¬های واریانس و فراسنجه¬های ژنتیکی تابع توزیع زنده¬مانی در میش¬های نژاد کرمانی. پژوهشهای علوم دامی ایران, 11(4), 489-499. https://doi.org/10.22067/ijasr.v11i4.72943
نوع مقاله
علمی پژوهشی- ژنتیک و اصلاح دام و طیور