براورد اثرات متقابل ژنوتیپ و اقلیم، اجزای واریانسی و وراثت پذیری برخی صفات باروری درجمعیت هلشتاین ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم دامی، واحد علوم و تحقیقات تهران، دانشگاه آزاد اسلامی، تهران، ایران

2 گروه علوم دامی، واحد شهرقدس، دانشگاه آزاد اسلامی، تهران، ایران

10.22034/aej.2021.279436.2488

چکیده

هدف این مطالعه ارزیابی اثرات متقابل ژنوتیپ و محیط و هم چنین براورد پارامتر های ژنتیکی برای صفات باروری (سن اولین زایش و فاصله بین دو زایش) در گاوهای نژاد هلشتاین در بین اقلیم های مختلف ایران بود. اطلاعات مورد نیاز در مرکز اصلاح نژاد دام کرج بین سال های 81 تا 96 جمع آوری شد. این اطلاعات بر اساس شرایط اقلیمی به سه محیط معتدل، نیمه سرد و سرد تقسیم شد. اجزای کواریانس و همبستگی ژنتیکی بر اساس مدل سه صفتی و با روش حداکثر درست نمایی محدود شده براورد شد. هرصفت درهر اقلیم به عنوان صفات مستقل در نظر گرفته شد. میزان وراثت پذیری صفات باروری در اقلیم سرد بالاتر و برای سن اولین زایش و فاصله بین دو زایش به ترتیب برابر 0/217 و 0/058 بود. هم چنین این صفات در اقلیم سرد عملکرد مناسب تری داشتند. همبستگی ژنتیکی برای صفت سن اولین زایش در محدوده 0/857 تا 0/897 و برای صفت فاصله بین دو زایش بین 0/487 و 0/859 قرار داشت. براورد همبستگی ژنتیکی در این تحقیق نشان داد که اثرات متقابل ژنوتیپ و محیط به خصوص برای صفت فاصله بین دو زایش باعث بیان ژنتیکی متفاوت حیوانات در اقلیم های مختلف شده است. هم چنین این نتایج نشان داد که اثرات متقابل ژنوتیپ و محیط بین اقلیم های مختلف می تواند باعث تغییر رتبه بندی دام های نر و ایجاد اریبی در برنامه های اصلاحی شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

estimation of genotype by climate interaction , variance component and heritability for fertility traits in Holstein population of Iran

نویسندگان [English]

  • Farzad Atrian Afiani 1
  • Sahereh Jozey Shekalgorabi 2
  • Mehdi Amin Afshar 1
  • Ali Asghar Sadeghi 1
1 Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Department of Animal Science, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

The aim of this study was to evaluate the mutual effects of genotype and environment and also to estimate genetic parameters for fertility traits (age of first calving and interval between two calvings) in Holstein cows in different climates of Iran. The required information was collected at Karaj Livestock Breeding Center between 2001 and 2017. This information was divided into three moderate, semi-cold and cold environments based on climatic conditions. Covariance components and genetic correlation were estimated based on the three-trait model and the restricted maximum likelihood method. Each attribute in each climate was considered as independent attributes. The heritability of fertility traits was higher in cold climate and the age of the first birth and the interval between two births were 0.217 and 0.058, respectively. Also, these traits performed better in cold climates. The genetic correlation for the age of the first birth trait was in the range of 0.857 to 0.897, and for the trait of the interval between two births, it was between 0.487 and 0.859. The estimation of genetic correlation in this research showed that the mutual effects of genotype and environment, especially for the trait of interval between two births, caused different genetic expression of animals in different climates. These results showed that the mutual effects of genotype and environment between different climates can change the performance of male cattle and not considering these effects may cause errors in breeding programs.

کلیدواژه‌ها [English]

  • Fertility traits
  • genotype × environmental
  • geographical conditions

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فصلنامه محیط زیست جانوری
دوره 14، شماره 1
شماره بهار
اردیبهشت 1401
صفحه 67-74

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