ارزیابی ژنتیکی صفات تولیدمثلی در گاوهای هلشتاین مجتمع شیر و گوشت مهدشت استان مازندران

نوع مقاله : مقاله کامل

نویسندگان

گروه علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

چکیده

هدف از این تحقیق برآورد همبستگی‌های ژنتیکی و مولفه‌های واریانس-کوواریانس صفات تولیدمثلی در گاوهای هلشتاین استان مازندران بود. بدین‌منظور رکورد‌های مربوط به سن اولین زایش(AFC)، فاصله بین دو زایش (CI)، طول دوره خشکی (DP)، تعداد روزهای باز (OD) و تعداد روزهای بین زایش و اولین تلقیح (DFS) مربوط به 5801 راس گاو هلشتاین از گله تجاری مهدشت مازندران طی سال‌های 1391 تا 1396 جمع‌آوری شد. ویرایش داده‌های شجره با استفاده از نرم‌افزار CFC انجام شد، مولفه‌های واریانس-کوواریانس و پارامترهای ژنتیکی صفات تولید‌مثلی در قالب مدل دام تک‌متغیره و روش حداکثر درستنمایی محدود شده با استفاده از نرم‌افزار wombat برآورد شدند. وراثت‌پذیری صفات تولید‌مثلی در این تحقیق 18/0، 17/0، 16/0، 08/0 و 12/0 به ترتیب برای DP ،DFS ،OD ،CI، AFC محاسبه شدند. همبستگی فنوتیپی ژنوتیپی بین همه صفات تولیدمثلی مثبت گزارش شد. همبستگی ژنتیکی بین صفات تولیدمثلی از 62/0 (فاصله زایمان تا اولین تلقیح- طول دوره خشکی) تا 94/0 (روزهای باز- فاصله زایش) متغیر بود. توارث‌پذیری پایین این صفات نشان می‌دهد انتخاب فنوتیپی منجر به پاسخ به انتخاب مطلوب نخواهد شد و برای ارزیابی ژنتیکی حیوانات استفاده از ارزش‌های اصلاحی و ارزیابی ژنتیکی شجره‌ای توصیه می‌شود. 

کلیدواژه‌ها


عنوان مقاله [English]

Genetic evaluation of reproductive traits in Holstein cows of Mahdasht Milk and Meat Company in Mazandaran province

نویسندگان [English]

  • Mohammad Zaman Dastranj
  • Mohsen Gholizadeh
  • hassan hafezian
Faculty of Animal Science and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
چکیده [English]

The aim of this study was to estimate the (Co) variance components and genetic correlations of reproductive traits in Holstein cows in Mazandaran province. For this purpose, records related to the age at first calving(AFC), calving interval (CI), dry period (DP), open days (OD) and number of days between calving and first insemination (DFS) were collected. Pedigree data were edited using CFC software and variance-covariance components and genetic parameters of reproductive traits were estimated in the form of univariate animal model with restricted maximum likelihood method using wombat software. Heritabilities of reproductive trait were calculated in this study as 0.18, 0.17, 0.16, 0.08 and 0.12 for AFC, CI, OD, DFS and DP, respectively. Phenotypic and genotypic correlations were estimated positive between all reproductive traits. Genetic correlation between reproductive traits ranged from 0.62 (calving to first insemination length - dry period) to 0.94 (open days - calving interval).The low heritability of these traits indicates that phenotypic selection will not lead to an optimal response to selection and the use of breeding values and genetic evaluation using pedigree information is recommended for animal genetic evaluation.

کلیدواژه‌ها [English]

  • Variance components
  • Calving interval
  • Heritability
  • Genetic correlation
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