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تحلیل فنوتیپی و ژنتیکی امتیاز سلول‌های بدنی شیر در گاوهای هلشتاین ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناس ارشد، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه صنعتی اصفهان

2 استادیار دانشکدۀ کشاورزی، دانشگاه پیام نور

3 استادیار، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه صنعتی اصفهان

چکیده

پژوهش حاضر به‌منظور برآورد اجزای واریانس، روند ژنتیکی و فنوتیپی امتیاز سلول‌های بدنی (SCS) با استفاده از داده‌های جمع‌آوری‌شده توسط مرکز اصلاح دام و بهبود تولیدات دامی کشور اجرا شد. در این مطالعه، از 850729 رکورد روز آزمون شمار سلول‌های بدنی (SCC) در دوره‌های شیردهی1 تا 4 مربوط به 32955 گاو ماده استفاده شد که در 472 گله طی سال‌های 1383 تا 1392 جمع‌آوری ‌شده بود. پارامترهای ژنتیکی با استفاده از مدل دام روزآزمون تکرارپذیر و نرم‌افزار ASReml برآورد شد. وراثت‌پذیری SCS، 176/0 و تکرارپذیری داخل و بین دوره‌های شیردهی به ترتیب203/0 و 362/0 برآورد شد. روند ژنتیکی و فنوتیپی با استفاده از تابعیت میانگین ارزش اصلاحی و فنوتیپی بر سال زایش به ترتیب 0246/0- و 047/0- محاسبه شد. این روند منفی و معنادار (P < 0.01) را می‌توان تا حدودی به بهبود ژنتیکی و برنامه‌های مدیریتی کنترل ورم پستان در سطح گاوداری‌های کشور نسبت داد.

کلیدواژه‌ها


عنوان مقاله [English]

Genetic and phenotypic analysis for somatic cell score in Iranian Holstein dairy cattle

نویسندگان [English]

  • Parisa Ghasemi Khani 1
  • Heydar Ghiasi 2
  • Ali Sadeghi-Sefidmazgi 3
1 . Former Graduate Student, Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
2 Assistant Professor, Department of Animal Science, Faculty of Agricultural Science, Payame Noor University, Tehran, Iran
3 Assistant Professor, Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
چکیده [English]

The objective of this study was to estimate variance components, genetic and phenotypic trends for somatic cell score. Dataset that collected by the Animal Breeding Center of Iran was used in this study. Data file included 850,729 test day records of somatic cell counts (SCC)  on 32,955 cows from lactations one to four, in 472 herds, gathered from years 2002 to 2013 in Iran. A test day repeatability animal model was used to estimate the genetic parameters and variance components using ASReml. The heritability was estimated 0.176. Estimated repeatability (± SE) for within (rwit) and between (racr) parities were 0.362 ± 0.006 and 0.230 ± 0.002, respectively. The genetic and phenotypic trend based on regression of average breeding values of SCS on year of birth, was -0.0246 and -0.047, respectively. This trend could be due to genetic improvement and mastitis management control programs that are widely being used across the dairy farms in country.

کلیدواژه‌ها [English]

  • genetic parameters
  • milk quality
  • Test day record
  • Mastitis
  • somatic cell
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