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برآورد مولفه های واریانس، روند و پارامترهای ژنتیکی صفت وزن تولد گاوهای هلشتاین در ایران | ||
| علوم دامی | ||
| مقاله 1، دوره 29، شماره 112، آذر 1395، صفحه 3-10 اصل مقاله (1.53 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/asj.2016.107415 | ||
| نویسنده | ||
| محمد رکوعی* | ||
| دانشیار گروه علوم دامی، دانشکده کشاورزی و گروه بیوانفورماتیک دانشگاه زابل | ||
| چکیده | ||
| وزن تولد اولین صفت قابل رکوردبرداری بعد از تولد حیوان است که بر صفات رشد، تولیدی، تولیدمثل، آسانزایی مادر و عملکرد آتی خود دام موثر است. در این بررسی، از اطلاعات 355582 رکورد وزن تولد گاوهای هلشتاین تحت پوشش مرکز اصلاح نژاد دام کشور، که طی سالهای 1367 تا 1389 جمع آوری شده، استفاده شد. نتایج حاصل از آزمون تابع درستنمائی برای مقایسه بین مدلهای 1 تا 5 با مدل 6 اختلاف کاملا معنیداری را نشان داد (001/0P<). توان آزمون تابع درستنمائی برای مقایسههای انجام شده بیشتر از 999/0 برآورد گردید و مدل 6 بهترین مدل شناخته شد. وراثتپذیری مستقیم، مادری و وراثتپذیری کل برای بهترین مدل برازش شده به ترتیب 269/0، 08/0 و 22/0 برآورد گردید. همچنین همبستگی ژنتیکی بین آثار ژنتیکی مستقیم و مادری 38/0- برآورد شد. روند ژنتیکی صفت وزن تولد افزایش نامنظمی را تا سال 1382 نشان داد (003/0 ± 016/0 کیلوگرم) و بعد از سال 1382 روند کاهشی داشت. نتایج حاصل از بررسی روند ژنتیکی نشان داد که از دیدگاه اصلاح نژاد، صفت وزن تولد تا کنون در گلههای گاو شیری مورد توجه قرار نگرفته است. همچنین نتایج حاصل از برآورد وراثتپذیری صفت وزن تولد بیانگر آن بود که امکان پیشرفت ژنتیکی این صفت در جمعیت گاوهای هلشتاین به کمک انتخاب فراهم میشود و صفت وزن تولد نیز میتواند به عنوان معیار اصلاح نژادی در برنامههای اصلاح نژادی مورد توجه قرار گیرد. | ||
| کلیدواژه‌ها | ||
| وراثت پذیری مستقیم؛ وراثت پذیری مادری؛ وراثت پذیری کل؛ همبستگی ژنتیکی؛ گاوهای شیری | ||
| عنوان مقاله [English] | ||
| Estimation of variance components, genetics trends and parameters for birth weight of Holstein cattle in Iran | ||
| نویسندگان [English] | ||
| M. Rokouei | ||
| چکیده [English] | ||
| Birth weight (BW) is the first trait that could be measured after birth. BW influences the growth, production, reproduction, and calving ease of the mother and also affects the future performance of the calf. The 355582 BW records of Holstein cows were used in this research which was recorded by Animal Breeding Center of Iran between 1988 and 2010. The likelihood ratio test showed that the differences between first 5 models and sixth model were significant (P<0.001). The power of test for all comparison was more than 0.999 indicating the best model is sixth model. The estimated direct heritability, maternal heritability and total heritability of best model were 0.269, 0.08 and 0.22, respectively. Also genetics correlation between direct and maternal effects was estimated at -0.38. The genetics trend was increased positively up to 2003 (0.016 ± 0.003 kg), after that, it negatively decreased. The result of genetic trend of BW showed that BW did not included in the breeding programs of dairy herds up to now, and it could be used as a selection index for genetics improvement in the Holstein dairy cattle population. | ||
| کلیدواژه‌ها [English] | ||
| Direct Heritability, Maternal Heritability, Total Heritability, Genetics correlation, Dairy cattle | ||
| مراجع | ||
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