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تعیین شاخص انتخاب بهینه بدون استفاده از ضرایب اقتصادی در مرغان بومی استان یزد | ||
| علوم دامی | ||
| دوره 34، شماره 130، خرداد 1400، صفحه 151-164 اصل مقاله (1.59 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/asj.2020.342662.2056 | ||
| نویسنده | ||
| بابک عنایتی* | ||
| دانش آموخته دکتری ژنتیک و اصلاح نژاد دام | ||
| چکیده | ||
| هدف از این مطالعه طراحی یک شاخص انتخاب بهینه بدون استفاده از ضرایب اقتصادی بر مبنای بهبود ژنتیکی مورد انتظار در صفات اقتصادی مهم بود. برای بررسی نتایج شاخص‌های طراحی شده از شبیهسازی تصادفی با 5 تکرار استفاده شد. صفات شبیهسازی شده شامل اوزان بدن در تولد (BW1)، هشت هفتگی (BW8)، دوازده هفتگی (BW12)، بلوغ جنسی (BWM)، سن در زمان اولین تخم‌گذاری (AFE)، وزن اولین تخم‌مرغ (EWM)، میانگین وزن تخم‌مرغ در هفته‌های 28 تا 32 (EW) و تعداد تخم‌مرغ (EN) بود. سه شاخص انتخاب شامل صفات BW12، EN و EW در هدف انتخاب و تمام صفات شبیهسازی شده در معیار انتخاب بود. شاخص‌ها با هدف ایجاد تغییر ژنتیکی برای 5 گرم در صفت EW، 20 عدد در صفت EN و تفاوت سه شاخص انتخاب اول تا سوم مربوط به تغییر مقادیر مورد انتظار به میزان 100، 200 و 300 گرم در صفت BW12 بود. نتایج نشان داد هر سه شاخص انتخاب قادرند بهبود یکنواخت و مطلوبی را در صفات ایجاد نمایند. اما شاخص انتخاب دوم قادر است در تعداد نسل کمتر این نتایج قابل را حاصل نماید (بهبود 304 گرم، 3/25 عدد و 4/6 گرم به ترتیب برای صفات BW12، EN و EW). همخونی ایجاد شده بعد از 5 نسل اجرای شاخص‌های انتخاب‌اول تا سوم مطلوب (در حدود 02/0) و تفاوت همخونی بین شاخص‌های انتخاب معنی‌دار نبود (4/0p>). پیشنهاد می‌شود در اصلاحنژاد مرغ بومی استان یزد از شاخص انتخاب دوم برای 5 نسل بهره‌برداری شود. | ||
| کلیدواژه‌ها | ||
| بهبود ژنتیکی مورد انتظار؛ تعداد نسل؛ شبیهسازی؛ همخونی | ||
| عنوان مقاله [English] | ||
| Determining the optimal selection index without using economic coefficients in native fowls of Yazd province | ||
| نویسندگان [English] | ||
| Babak Enayati | ||
| Independent Scholar | ||
| چکیده [English] | ||
| The aim of this study was to design optimal selection index without the use of economic coefficients based on the expected genetic gains in economic traits. Random simulation with 5 replications was used to evaluate the results of the designed indices. Simulated traits include body weight at birth (BW1), eight weeks (BW8), twelve weeks (BW12), maturation (BWM), age at first laying (AFE), weight of first egg (EWM), the mean egg weight from 28 to 32 weeks (EW) and the egg number (EN). In three indices, BW12, EN and EW traits were in the selection target and all simulated traits were in the selection criterion. Indices with the aim of genetic gain for 5 g in EW, 20 in EN and the difference between the three indices of the first to third selection were related to the change in the expected values of 100, 200 and 300 gr in BW12. The results showed that all three selection indicators are able to create a uniform and desirable genetic gain in traits. However, the second index is able to achieve acceptable results in a smaller number of generations (304 gr, 25.3 and 6.4 gr genetic gain for BW12, EN and EW, respectively). The inbreeding after 5 generations of the implementation of the first to third indices was not desirable (approximately 0.02) and the difference in inbreeding between the indices was not significant (P> 0.4). It is suggested that the second index for 5 generations be used for the Yazd province native fowls breeding. | ||
| کلیدواژه‌ها [English] | ||
| Expected genetic gain, generation number, inbreeding, simulation | ||
| مراجع | ||
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