اثرات ژنتیکی مستقیم و مادری برای صفات رشد گوسفند سنجابی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی ایلام، سازمان تحقیقات، آموزش و ترویج کشاورزی، ایلام، ایران

2 بخش تحقیقات ژنتیک و اصلاح نژاد، موسسه تحقیقات علوم دامی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران

3 بخش تحقیقات تغذیه دام و طیور، موسسه تحقیقات علوم دامی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران

چکیده

برآورد پارامترهای ژنتیکی صفات اقتصادی جهت اجرای برنامه های اصلاح نژادی نقش کاربردی و پیش نیاز دارند. لذا هدف از مطالعه حاضر برآورد پارامترهای ژنتیکی و بررسی اثرات ژنتیکی مستقیم و مادری صفات رشد گوسفندان سنجابی بود. از اطلاعات گله گوسفند سنجابی ایستگاه مهرگان که طی سال‌های 1393تا 1400جمع آوری شده بود استفاده گردید. 6 مدل حیوانی با و بدون اثرات ژنتیکی و محیطی دائمی مادری استفاده گردید. مدل مناسب برای تجزیه و تحلیل نهایی صفت بر اساس مقایسه نسبت لگاریتم درستنمایی و معیار آکاییک تشخیص داده شد. برای صفات اوزان تولد، 3 و 6 ماهگی، افزایش وزن روزانه از تولد تا 3 ماهگی و از 3 تا 6 ماهگی، نسبت کلیبر از تولد تا 3 ماهگی و از 3 تا 6 ماهگی به ترتیب مدل‌های 2، 2، 2، 5، 5، 2 و 5 معنی‌دار بودند (0/05>P). وراثت پذیری مستقیم بر اساس مدل معنی‌دار برای صفات اوزان تولد، 3 و 6 ماهگی، افزایش وزن روزانه از تولد تا 3 ماهگی و از 3 تا 6 ماهگی، نسبت کلیبر از تولد تا 3 ماهگی و از 3 تا 6 ماهگی به ترتیب برابر 0/05، 0/103، 0/182، 0/422، 0/004، 0/135 و 0/001 براورد شدند. وراثت پذیری مادری برای صفات اوزان تولد، 3 و 6 ماهگی، افزایش وزن روزانه از تولد تا 3 ماهگی و از 3 تا 6 ماهگی، نسبت کلیبر از تولد تا 3 ماهگی و از 3 تا 6 ماهگی به ترتیب معادل 0/122، 0/191، 0/166، 0/087، 0/024، 0/156 و 0/004 محاسبه گردید. نسبت واریانس محیطی دائمی مادری به واریانس فنوتیپی برای صفات افزایش وزن روزانه از تولد تا 3 ماهگی و از 3 تا 6 ماهگی، و نسبت کلیبر از 3 تا 6 ماهگی به ترتیب 0/088، 0/001 و 0/016 به دست آمدند. اثرات ژنتیکی و محیطی دائمی مادری بر صفات رشد معنی دار بودند و منظور نکردن آن ها در مدل نهایی تجزیه و تحلیل، موجب برآورد کم تر از حد پارامترهای ژنتیکی خواهد شد. هم چنین مقادیر وراثت پذیری برآورد شده نشان داد که صفات رشد گوسفند سنجابی به انتخاب ژنتیکی پاسخ می‌دهند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Direct and maternal genetic effects of growth traits for Sanjabi sheep

نویسندگان [English]

  • Javad Ahmadpanah 1
  • Ali Javanrouh 2
  • Hassan Khamisabadi 3
1 Animal Science Research Department, Ilam Agriculture and Natural Resources and Education Center, Agriculture Research, Education and Extension Organization, Ilam, Iran
2 Animal Breeding and Genetic Department, Animal Science Research Institute, Agricultural Research Education and Extension Organization, Karaj, Iran
3 Animal and Poultry Nutrition Research Department, Animal Science Research Institute, Agricultural Research Education and Extension Organization, Karaj, Iran
چکیده [English]

Estimation of genetic parameters for economic traits has a practical and prerequisite role for the implementation of animal breeding programs. Therefore, the aim of current study was to evaluate direct and maternal genetic effects for growth traits of Sanjabi sheep. Used data was related to Sanjabi herd of Mehregan station in 2016 to 2021. For the traits, 6 animal models differed on maternal genetic abd permanent environmental effects were taken into accounts. Proper model was identified for the final trait analysis based on a comparison of the log likelihood ratio and the Akaike criterion. Significant model for birth, 3 and 6 months’ weights, daily weight gain from birth to 3 and 3 to 6 months, and kleiber ratios from birth to 3 and 3 to 6 months was 2, 2, 2, 5, 5, 2 and 5, respectively (P<0.05). Direct heritabilities based on appropriate model for birth, 3 and 6 months’ weights, daily weight gain from birth to 3 and 3 to 6 months, and kleiber ratios from birth to 3 and 3 to 6 months were 0.05, 0.103, 0.182, 0.422, 0.004, 0.135 and 0.001, respectively. Also, maternal heritabilities for birth, 3 and 6 months’ weights, daily weight gain from birth to 3 and 3 to 6 months, and kleiber ratios from birth to 3 and 3 to 6 months were 0.122, 0.191, 0.166, 0.087, 0.024, 0.156 and 0.004, respectively. The ratio of maternal permanent environmental effect on phenotypic variance for daily weight gain from birth to 3 and 3 to 6 months, and kleiber ratio from 3 to 6 months were 0.088, 0.001, and 0.016, respectively. Estimated direct heritabilities were moderate to high, representing abilitiy for response to selection. Maternal effects, genetic and permanent environmental, were significant. Neglecting maternal effects in the final model of analysis make the genetic parameters overestimated. Estimated heritabilities showed that growth traits of Sanjabi sheep can response to selection.

کلیدواژه‌ها [English]

  • Genetic parameters
  • Growth traits
  • Maternal effects
  • Sanjabi sheep
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