برآورد همبستگی ژنتیکی بین سخت‌زایی با صفات تولیدی، تولید مثل و وزن تولد در گاوهای هلشتاین ایران با استفاده از مدل خطی آستانه‌ای بیزی

پژوهشهای علوم دامی ایران

مقاله 10، دوره 9، شماره 2 - شماره پیاپی 30، تیر 1396، صفحه 255-267   

نوع مقاله: علمی پژوهشی- ژنتیک و اصلاح دام و طیور

شناسه دیجیتال (DOI): 10.22067/ijasr.v9i2.56969

نویسندگان

مهدیه رخشانی نژاد¹؛ محمد رکوعی^{* 1}؛ مریم صفدری شاهرودی²؛ هادی فرجی آروق³

¹گروه علوم دامی، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران

²دانشکده کشاورزی شهریار

³پژوهشکده دام‌های خاص، دانشگاه زابل، زابل، ایران

چکیده

گوساله‌زایی یک رویداد مهم در هر گله است که به هنگام سخت بودن زایمان با عوارض اقتصادی و رفاهی حیوان همراه است. هدف از این تحقیق برآورد همبستگی ژنتیکی و محیطی بین سخت‌زایی با صفات تولیدی (تولید شیر، چربی و پروتئین 305 روز شیردهی)، تولید مثلی (فاصله گوساله‌زایی، فاصله زایش تا اولین تلقیح و فاصله اولین سرویس تا تلقیح منجر به آبستنی) و وزن تولد در گاوهای هلشتاین ایران با مدل خطی – آستانه‌ای بیزی بود. به این منظور، داده‌های جمع‌آوری شده بین سال‌های 1368 تا 1391 توسط مرکز اصلاح نژاد دام کشور مورد استفاده قرار گرفت. سخت‌زایی (به‌عنوان صفت آستانه‌ای) با صفات دیگر (صفات خطی) به‌صورت تجزیه و تحلیل دو صفتی توسط نمونه‌گیری گیبس با استفاده از نرم افزار DMU مورد تجزیه‌ و تحلیل قرار گرفت. همبستگی ژنتیکی سخت‌زایی با تولید شیر، پروتئین و فاصله اولین سرویس تا تلقیح منجر به آبستنی منفی و با بقیه صفات مثبت به دست آمد. بالاترین همبستگی ژنتیکی بین سخت‌زایی با وزن تولد و فاصله اولین سرویس تا تلقیح منجر به آبستنی برآورد شد (به ترتیب 516/0 و 406/0-). همبستگی محیطی بین سخت‌زایی و صفات تولید منفی (016/0- تا 019/0-) و برای بقیه صفات مثبت با مقادیر ناچیز بود. نتایج نشان می‌دهد وزن بالای تولد گوساله منجر به بالا بودن سخت‌زایی شده و از طرف دیگر، افزایش سخت‌زایی منجر به افزایش فاصله زایش تا اولین تلقیح و کاهش فاصله اولین سرویس تا تلقیح منجر به آبستنی می‌شود.

کلیدواژه‌ها

سخت‌زایی؛ صفات تولید مثلی؛ صفات تولیدی؛ گاو هلشتاین ایران؛ مدل آستانه‌ای

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