Comparison of Ordinary and Restricted Selection Indices on Genetic Gain of Body Weight in Iranian Moghani Sheep
محورهای موضوعی : Camelح. قیاسی 1 , م. خالداری 2 , ر. طاهر خانی 3
1 - Department of Animal Science, Faculty of Agricultural Science, Payame Noor University, Tehran, Iran
2 - Department of Animal Science, Faculty of Agricultural Science, Lorestan University, Khorramabad, Iran
3 - Department of Animal Science, Faculty of Agricultural Science, Lorestan University, Khorramabad, Iran
کلید واژه: body weight, Moghani sheep, genetic gain, restricted selection indices,
چکیده مقاله :
The effect of ordinary and restricted selection indices on body weight at different ages changes in birth weight of Iranian Moghani sheep was studied. Traits in the aggregate genotype were birth weight (BW), body weights at 3 (BW3) and 12 months of age (BW12). Two ordinary selection indices (I1 and I2) and two restricted selection indices (R1 and R2) were constructed. BW and BW3 were included in I1 and R1 and BW, BW3 and BW6 were included in I2 and R2. The ranges of expected genetic gains in I1 and I2 for BW, BW3 and BW12 per generation were 0.080 to 0.068, 0.210 to 0.177 and 0.546 to 0.662 kg, respectively. Increasing BW may cause a disorder in the future of breeding goal due to dystocia. Restricted selection indices were constructed to increase BW3 and BW12 while keeping genetic gain in BW to zero. Under selection by indices of R1 and R2 the amount of genetic gain in BW was zero, while considerable genetic gains were obtained for BW3 (0.094 to 0.062) and BW12 (0.39 to 0.60). Ordinary and restricted selection indices were then evaluated in a simulated population. Predicted genetic gains for BW, BW3 and BW12 from ordinary and restricted selection indices were similar to the predicted genetic gains. For both restricted selection indices (R1 and R2) predicted genetic gains for BW3 and BW12 in the simulated population increased over the generations whereas BW decreased slightly over the generations.
اثر شاخص انتخاب معمولی و محدود شده بر اساس وزن بدن در سنین محتلف بر تغییرات وزن تولد در گوسفند مغانی مورد بررسی قرار گرفت. صفات در تابع هدف شامل: وزن تولد (BW)، وزن بدن در سه ماهگی (BW3) و وزن بدن در 12 ماهگی (BW12) بود. دو شاخص انتخاب معمولی (I1 و I2) و دو شاخص انتخاب محدود شده (R1 و R2) تشکیل شد. BW و BW3 در شاخص I1 و R1 وBW ، BW3 و BW6 (وزن بدن در 6 ماهگی) در شاخص I2 و R2 لحاظ شدند. پاسخ ژنتیکی مورد انتظار در هرنسل در شاخص I1 و I2 برای صفاتBW ، BW3 و BW12 به ترتیب برابر 08/0 تا 068/0، 210/0 تا 177/0 و 546/0 تا 662/0 کیلوگرم بود. افزایش BW ممکن است سبب افزایش مشکلاتی مانند سخت زایی گردد. شاخصهای انتخاب محدود شده به منظور افزایشBW3 و BW12 در حالی که تغییرات در BW در حد صفر باقی بماند، تشکیل شدند. در اثر انتخاب بر اساس R1 و R2 پاسخ ژنتیکی مورد انتظار برای BW3 (094/0 تا 062/0) و BW12 (39/0 تا 06/0 کیلوگرم) بود در حالیکه پاسخ ژنتیکی برای BW برابر صفر بود. شاخصهای انتخاب معمولی ومحدود شده سپس در جمعیت شبیهسازی شده مورد بررسی قرار گرفتند. پاسخهای ژنتیکی مشاهده شده و مورد انتظار برای هر دو شاخص محدود شده و معمولی مشابه بود. در شاخصهای R1 و R2 پاسخ ژنتیکی مشاهده شده برای BW تا حدی در طول نسل کاهش یافت.
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