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تعیین شاخص انتخاب اقتصادی برای صفات رشد در سیستم پرورش نیمه متمرکز بز مرخز شاخصهای انتخاب اقتصادی در سیستم پرورش سنتی بز مرخز | ||
| علوم دامی ایران | ||
| دوره 55، شماره 2، تیر 1403، صفحه 349-366 اصل مقاله (1.99 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijas.2023.362055.653954 | ||
| نویسندگان | ||
| فرهاد حسین زاده شیرذیلی1؛ ساحره جوزی شکالگورابی* 2؛ مهدی امین افشار3؛ محمد رزم کبیر4 | ||
| 1گروه علوم دامی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران. | ||
| 2گروه علوم دامی، واحد شهرقدس، دانشگاه آزاد اسلامی، تهران، ایران | ||
| 3گروه علوم دامی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران | ||
| 4گروه علوم دامی، دانشکده کشاورزی، دانشگاه کردستان، سنندج، ایران. | ||
| چکیده | ||
| هدف این پژوهش مطالعهی شاخصهاى انتخاب اقتصادى براى افزایش اوزان بدن در بز مرخز میباشد. صفات وزن بدن در سنین مختلف (تولد، شیرگیری، 6 ماهگی و 9 ماهگی) در چندین شاخص انتخاب دو صفتی و سه صفتی قرار گرفتند. پارامترهای ژنتیکی با نرم‌افزار MTGSAM و روش آماری بیزی برآورد شدند. آنالیزهای مربوط به شاخص انتخاب با نرم‌افزار SelAction انجام گرفت. نتایج مقایسات شاخصهای سه صفتی نشان داد بیشترین رشد اقتصادی کل در شاخص انتخاب معادل 86/4 دلار بود (شاخص 9I). علاوهبراین پاسخ اقتصادى کل در شاخص انتخاب دو صفتی (شاخص 4I ) با 94/3 دلار بیش از 5 شاخص دوصفتی دیگر بدست آمد. بیشترین پیشرفت ژنتیکی مستقیم حاصل از شاخصهای سه صفتی در وزن 9 ماهگی حدود 63/0 کیلوگرم پیشبینی شد (شاخصهای 8I و 9I). بیشترین پیشرفت ژنتیکی مستقیم حاصل از شاخصهای دو صفتی نیز در وزن 9 ماهگی برابر با 66/0 کیلوگرم پیشبینی شد (شاخص 3I). با مطالعهی اثر بولمر (کاهش واریانس و وراثت‌‌پذیری بر اثر انتخاب) در پیش بینیهای این مطالعه، مشخص شد که مقدار واریانس فنوتیپی، وراثت‌‌پذیری و همبستگی صفات بعد از انتخاب کاهش یافته و میزان این کاهش تحت تاثیر مقدار واریانس فنوتیپی/ ژنتیکی، وراثت‌‌پذیری اولیه در جمعیت، شدت انتخاب در هر صفت، انتخاب مستقیم یا غیرمستقیم و تعداد صفت در شاخص انتخاب قرار دارد. درنتیجه برای حداکثرسازی سود اقتصادی کل، دو شاخص انتخاب 9I و4I در شرایط جمعیت بز مرخز حاضر پیشنهاد میگردد. اما برای حفظ واریانس فنوتیپی و ژنتیکی صفات لازم است به استراتژیهایی مانند شدت انتخاب، ضرایب اقتصادی صفات، انتخاب غیرمستقیم و افزایش تعداد صفت در شاخص انتخاب توجه بیشتری داشت. | ||
| کلیدواژه‌ها | ||
| بز مرخز؛ شاخص انتخاب؛ سود اقتصادی؛ اثر بولمر | ||
| عنوان مقاله [English] | ||
| Determining the economic selection index for growth traits in the semi-intensive rearing system of Merkhoz goats Economic selection indices in the traditional goat breeding system | ||
| نویسندگان [English] | ||
| Farhad Hosseinzadeh Shirzeyli1؛ Sahereh Joezy-Shekalgorabi2؛ Mehdi Amin-Afshar3؛ Mohammad Razmkabir4 | ||
| 1Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| 2Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| 3Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran. | ||
| 4Department of Animal Science, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran. | ||
| چکیده [English] | ||
| The aim of this research was to study different economic selection indices to increase body weight in Markhoz goat breed. Body weight (BW) at different ages (birth, weaning, 6-month and 9-month) were categorized as several two- and three-traits selection indices. Genetic parameters were estimated with MTGSAM using the Bayesian statistical method. Selection index analyzes were done using SelAction software. The results of comparing three-trait indices showed that highest total economic gain resuled from I9 which was US$4.86. The total economic response for two-trait index belonged to I4 which was US$3.94 and higher than 5 others. The highest direct genetic gain from three-trait indices was predicted for 9-month weight in I8 and I9 indices to be about 0.63 kg. In addition, the highest direct genetic improvement resulting from two-trait indices was also predicted for the 9-month weight in the I3 to be 0.66 kg. Moreover, the selection and performance criteria revealed decrease in phenotypic variance, heritability, and genetic correlation of traits. These changes differed in alternative selection schemes, which influenced by the initial population parameters, selection intensity, direct or indirect selection, and the number of traits included in the selection index. In conclusion, to maximize the total economic gain, two selection indices I9 and I4 can be suggested for the current condition of the Markhoz goat population. However, to preserve the phenotypic/genetic variance of traits, it is necessary to focus on strategies such as selection intensity, economic coefficients, indirect selection, and increasing the number of traits in selection indices. | ||
| کلیدواژه‌ها [English] | ||
| Markhoz goat, Selection Index, Economic gainBulmer effect | ||
| مراجع | ||
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