Effect of Using Reproductive Technologies on Genetic Progress in Sistani Native Cattle of Iran: A Simulation Study

محورهای موضوعی : Camel

ه. فرجی-آروق ¹ (Research Center of Special Domestic Animals, University of Zabol, Zabol, Iran)
م. رکوعی ² (Department of Animal Science and Bioinformatics, Faculty of Agriculture, University of Zabol, Zabol, Iran)
ع. مقصودی ³ (Department of Animal Science and Bioinformatics, Faculty of Agriculture, University of Zabol, Zabol, Iran)
م. مهری ⁴ (Department of Animal Science, Faculty of Agriculture, University of Zabol, Zabol, Iran)
س. انصاری مهیاری ⁵ (Department of Animal Science, College of Agriculture, Isfahan University of Technology, Isfahan, Iran)
ا. کریستین سورنسن ⁶ (Department of Molecular Biology and Genetics, Center for Quantitative Genetics and Genomics, Blichers Allé 208830, Tjele, Denmark)

تاریخ دریافت : 1396/10/26 تاریخ پذیرش : 1397/05/09 تاریخ انتشار : 1397/12/10

کلید واژه: artificial insemination, embryo transfer, random mating, Sistani cattle,

چکیده مقاله :

The effect of artificial insemination (AI), embryo transfer (ET) to bull dams (BD), and sexed semen (SS) to cow dams (CD) with and without controlling inbreeding were studied using stochastic simulation. Three levels of embryo transfer (no ET, ET on all BD, and ET on 20% of BD), five levels of sexed semen (no SS: control, SS-X on all CD, SS-X on 20% CD, SS-Y on all CD, and SS-Y on 20% CD), three levels of artificial insemination (no AI, AI on 50% cows, and AI on 90% cows), two levels of mating system (random and minimum consistory) were combined together to make 66 scenarios in which the combination of no ET, no SS, and no AI are assigned as a control. The simulated population consisted of 40 herds with 50 cows each was monitored for 30 years. The results showed that the use of AI, ET, and SS techniques increased the annual change of total merit index (TMI), inbreeding, and selection accuracy. Compared to control, the rate of annual change in TMI and inbreeding were increased as 41.95, 36.91 and 83.91%; and 192, 57 and 207%, for using of AI, ET and combination of SS + AI + ET, respectively. The minimum consistory mating decreased inbreeding, but not affected other parameters. The results suggested that using of ET on 20% BD, SS-Y for all CD, and 90% AI alone or in combination with each other along with minimum consistory mating might resulted in high genetic progress and low inbreeding rate. These technologies and inbreeding control strategies may increase the ratio of annual change of TMI to inbreeding.

چکیده انگلیسی:

اثر تلقیح مصنوعی (AI)، انتقال جنین (ET) برای مادر نرها (BD) و اسپرم تعیین جنس شده (SS) برای مادر گاوها (CD) با و بدون کنترل هم ­خونی با استفاده از شبیه ­سازی تصادفی مورد مطالعه قرار گرفت. سه سطح انتقال جنین (بدون انتقال جنین، انتقال جنین برای کل مادر نرها و انتقال جنین برای 20 درصد مادر نرها)، پنج سطح اسپرم تعیین جنس شده (اسپرم معمولی، اسپرم حاوی کروموزوم X برای کل و 20 درصد مادر گاوها، اسپرم حاوی کروموزوم Y برای کل و 20 درصد مادر گاوها)، سه سطح تلقیح مصنوعی (بدون تلقیح مصنوعی، تلقیح مصنوعی برای 50 و 90 درصد گاوها) و دو سطح آمیزش (تصادفی و حداقل هم­تباری) باهم ترکیب شده و 66 راهبرد مورد بررسی قرار گرفت و ترکیب بدون تلقیح مصنوعی، انتقال جنین و اسپرم معمولی به‌ عنوان گروه کنترل منظور گردید. جمعیت شبیه­ سازی شده شامل 40 گله 50 رأسی برای مدت 30 سال بود. نتایج نشان داد که استفاده از تکنیک­ های تلقیح مصنوعی، انتقال جنین و اسپرم تعیین جنس شده نرخ سالیانه شاخص شایستگی کل (TMI)، هم­ خونی و صحت انتخاب را افزایش دادند. در مقایسه با گروه کنترل، نرخ تغییرات سالیانه شاخص شایستگی کل برای استفاده از تکنیک ­های تلقیح مصنوعی، انتقال جنین و ترکیب سه تکنیک (تلقیح مصنوعی، انتقال جنین و اسپرم تعیین جنس شده) به ترتیب 95/41، 91/36 و 91/83 درصد و تغییرات سالیانه هم­خونی به ترتیب 192، 57 و 207 درصد افزایش یافت. آمیزش با حداقل هم ­تباری هم­خونی را کاهش داد، اما بر پارامترهای دیگر تأثیری نداشت. نتایج پیشنهاد می­ کند که استفاده از انتقال جنین برای 20 درصد مادر نرها، اسپرم حاوی کروموزوم Y برای کل مادر گاوها و تلقیح مصنوعی برای 90 درصد گاوها به تنهایی و در ترکیب با یکدیگر به همراه آمیزش حداقل هم ­تباری ممکن است منجر به پیشرفت ژنتیکی بیشتر و کمترین نرخ هم­ خونی شود. این فن­ آوری‌ها و استراتژی کنترل هم ­خونی ممکن است نسبت تغییر سالیانه شاخص شایستگی کل به تغییرات سالیانه هم­ خونی را افزایش دهد.

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