برآورد فراسنجه‌‌ها و روند ژنتیکی صفت امتیاز یاخته‌های بدنی با استفاده از رکورد‌های روز ‌آزمون گاو‌های هلشتاین ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکدة کشاورزی دانشگاه زنجان

2 دانشیار و استادیار، دانشکدة کشاورزی دانشگاه زنجان

3 استادیار، دانشکدة کشاورزی دانشگاه زنجان

4 استادیار، دانشکدة کشاورزی و منابع طبیعی دانشگاه اراک

چکیده

هدف از این تحقیق برآورد فراسنجه‌ها و روند ژنتیکی صفت امتیاز یاخته­های بدنیبا استفاده از رکوردهای روز آزمون تولید شیر گاوهای هلشتاین ایران بود. داده­های مورداستفاده شامل 407167 رکورد روز آزمون بین سال­های 1388 تا 1392 مربوط به دورة شیردهی اول بود که توسط مرکز اصلاح نژاد و بهبود تولیدات دامی کشور گرد­آوری شده بود. شمار یاخته­های بدنی2 با تبدیل لگاریتمی به امتیاز یاخته­های بدنی تبدیل شد. برآورد فراسنجه‌های ژنتیکی با استفاده از مدل تابعیت (رگرسیون) تصادفی با روش آماری بیزی مبتنی بر نمونه­گیری گیبس انجام شد. روند مشاهده‌شده برای واریانس ژنتیکی افزایشی و محیطی دائمی همسان و در اوایل دورة شیردهی بالاتر از دیگر روزهای شیردهی برآورد شد. وراثت­پذیری امتیاز یاخته­های بدنی برای دورة شیردهی اول 023/0 تا 065/0 برآورد شد. تکرارپذیری در آغاز و پایان دورة شیردهی بیشترین میزان نسبت را داشت. همبستگی ژنتیکی افزایشی بین روزهای 5 و 305 دورة شیردهی برآورد شد. روند ژنتیکی امتیاز یاخته­های بدنی در سال­های مختلف تغییر به نسبت زیادی داشت و تغییرپذیری ژنتیکی امتیاز یاخته­های بدنی از روند مشخصی پیروی نمی­کند.

کلیدواژه‌ها

عنوان مقاله [English]

Estimation of genetic parameters and trend of somatic cell score trait using test day records in Iranian Holstein cows

نویسندگان [English]

  • Somaye Panje Shiri 1
  • Moradpasha Eskandari Nasab 2
  • Mohammadbagher Zandi 3
  • Mohammad Hossein Moradi 4
1 M. Sc. Student, Department of Animal Science, Faculty of Agriculture, University of Zanjan, Iran
2 Associate Professor, Department of Animal Science, Faculty of Agriculture, University of Zanjan, Iran
3 Assistant Professor, Department of Animal Science, Faculty of Agriculture, University of Zanjan, Iran
4 Assistant Professor , Department of Animal Science, Faculty of Agriculture and Natural Science, Arak University, Iran
چکیده [English]

The objective of this research was to estimate the genetic parameters and trend of somatic cell count in Holstein cows of Iran using test day records. The phenotypic the used data consisted of were consisting of 407167 first lactation test day records the which were collected by the center of Animal Breeding and Livestock Production Improvement center of Iran during 2009 to 2013. Somatic cell count was transformed to Somatic cell score using logarithm transformation method. The genetic parameters were estimated using random regression models with Bayesian statistical method based on Gibbs sampling. The results revealed that the observed trend for additive genetic variance and permanent environmental were similar high in early lactation compared to other days. The heritability was estimated between 0.023-0.065 for somatic cell score. Repeatability showed highest changes at the start and the end of lactation. Additive genetic correlations were estimated for days 5 and 305. The result showed high variation in genetic trend of somatic cell score in different years, without an specific trend.

کلیدواژه‌ها [English]

  • Gibbs sampling
  • random regression model
  • somatic cell score
  • teest day recordes

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  • تاریخ دریافت: 20 خرداد 1394
  • تاریخ بازنگری: 26 فروردین 1395
  • تاریخ پذیرش: 06 تیر 1395

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