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همبستگی ژنتیکی بین صفات تولیدی و صفات تیپ در گاوهای هلشتاین: یک مطالعه فراتحلیل | ||
| علوم دامی ایران | ||
| دوره 56، شماره 1، فروردین 1404، صفحه 139-154 | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijas.2024.371599.653995 | ||
| نویسندگان | ||
| ثریا رفیعی1؛ سید رضا میرائی آشتیانی* 2؛ علی صادقی سفید مزگی3؛ حسن مهربانی یگانه4 | ||
| 1گروه علوم دامی دانشکده کشاورزی دانشگاه تهران. کرج. ایران | ||
| 2گروه علوم دامی دانشکده کشاورزی دانشگاه تهران، کرج. ایران | ||
| 3گروه علوم دامی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| 4گروه علوم دامی، دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران | ||
| چکیده | ||
| هدف پژوهش کنونی، بررسی ارتباط صفات تولیدی (تولید شیر، مقدار چربی و مقدار پروتئین) با صفات تیپ در گاوهای هلشتاین از طریق اجرای فراتحلیل بود. فراتحلیل روشی آماری است که برای ترکیب و خلاصه کردن نتایج کمی تحقیقات پیشین استفاده میشود. با استفاده از جستجوی منظم، تعداد 27 مطالعه در زمینه همبستگی ژنتیکی بین صفات تولیدی و صفات تیپ، بررسی و استفاده شد، که از اطلاعات تعداد 1407558، 1252515 و 1159124 گاو به ترتیب برای تولید شیر، مقدار چربی و مقدار پروتئین، در این فراتحلیل استفاده گردید. بستر نرم افزاری metafor در محیط R برای این تحقیق بهکار گرفته شد. یافتهها نشان داد که صفات تولیدی ضرایب همبستگی ژنتیکی پایین تا متوسط با هر یک از صفات تیپ داشتند. تولید شیر، بیشترین همبستگی ژنتیکی را با زاویهدار بودن 36/0، امتیاز وضعیت بدنی 31/0-، عمق پستان 30/0- و عرض پستان عقب 26/0 داشت. بیشترین همبستگی ژنتیکی بین مقدار چربی با زاویهدار بودن 39/0 و امتیاز وضعیت بدنی 25/0- وجود داشت. همچنین بیشترین همبستگی ژنتیکی مقدار پروتئین با زاویهدار بودن 46/0، عرض پستان عقب 39/0، عمق پستان 29/0- و زاویه کپل 28/0 برآورد شد. زاویهدار بودن به عنوان مهمترین صفت تیپ که بالاترین همبستگی ژنتیکی را با صفات تولیدی داشت، شناخته شد. آماره ناهمگنیI2 (میزان واریانس میان مطالعات) در بیشترین سطح (بیشتر از 99%) معنیدار بود. نتایج این پژوهش میتواند در برآورد ارزشهای اقتصادی صفات تیپ جهت ایجاد شاخص ملّی برای گاوهای هلشتاین مورد استفاده قرار گیرند. | ||
| کلیدواژه‌ها | ||
| صفات تیپ؛ صفات تولیدی؛ فراتحلیل؛ گاو هلشتاین | ||
| عنوان مقاله [English] | ||
| Correlations among production and linear type traits in Holstein cows: A meta-analysis study | ||
| نویسندگان [English] | ||
| Sorayya Rafiee1؛ S Reza Miraei-Ashtiani2؛ Ali Sadeghi-Sefidmazgi3؛ Hasan Mehrabani Yeganeh4 | ||
| 1Department of Animal Science, Faculty of Agriculture, University of Tehran.Karaj. Iran | ||
| 2Department of Animal Science, Faculty of Agriculture, University of Tehran, Karaj. Iran | ||
| 3Department of Animal Science, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran | ||
| 4Department of Animal Science, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran | ||
| چکیده [English] | ||
| The objective of this research was estimation of genetic correlations between production and linear type traits in Holstein cows, through a meta-analysis study. Using a systematic search of the literature, we found 27 papers in which the estimation of genetic correlations among production and type traits were reported. On the whole, the published data had been recorded from 1407598, 1252515 and 1159124 animals, respectively corresponded to milk yield, fat and protein content. Analyses were performed by using the metafor-package of R environment. The obtained results showed that there are low to moderate genetic correlations among production and type traits. Milk yield showed higher genetic correlation with angularity 0.36, body condition score -0.31, udder depth -0.30, and rear udder width 0.26. Fat content also was genetically correlated with angularity 0.39 and body condition score -0.25. In addition, protein content had high genetic correlation with angularity 0.46, rear udder width 0.39, udder depth -0.29, and rump angle 0.28. According to the meta-analysis, angularity was distinguished as a main type trait that displayed the highest genetic correlation with production traits. Test of heterogeneity ( statistics) indicated that there was significant heterogeneity (variance among studies) at the highest level (more than 99%). All type traits which had high genetic correlation with production traits would be recommended for being used as indicator traits of production by virtue of the size of their correlations with production traits. Results of this study can be used for estimating type traits economic values in Holstein cow’s selection indices. | ||
| کلیدواژه‌ها [English] | ||
| Holstein Cow, Meta-analysis, Production Traits, Type Traits | ||
| مراجع | ||
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