Genetic Evaluation of Growth Rate and Efficiency Related Traits in Raeini Cashmere Goat
محورهای موضوعی : Camel
م.س. مختاری
1
(Department of Animal Science, Faculty of Agriculture, University of Jiroft, Jiroft, Iran)
م. رزم‌کبیر
2
(Department of Animal Science, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran)
ح. قیاسی
3
(Department of Animal Science, Faculty of Agricultural Science, Payame Noor University, Tehran, Iran)
ی. محمدی
4
(Department of Animal Science, Faculty of Agriculture, Ilam University, Ilam, Iran)
کلید واژه: growth rate, Kleiber ratio, Goat, growth efficiency, maternal effects,
چکیده مقاله :
Growth efficiency-related traits are of economic importance for genetically improving of small ruminants especially in tropics with pastures of low quality and quantity. Data on body weights of Raeini Cashmere goat collected from 1979 to 2012 in Raeini breeding station, Kerman province, south-eastern part of Iran were used for estimating the genetic parameters of average daily gain from birth to weaning (ADG1), average daily gain from weaning to six months of age (ADG2), average daily gain from birth to six months of age (ADG3), Kleiber ratio from birth to weaning (KR1), Kleiber ratio from weaning to six months of age (KR2), Kleiber ratio from birth to six months of age (KR3), growth efficiency from birth to weaning (GE1), growth efficiency from weaning to six months of age (GE2) and growth efficiency from birth to six months of age (GE3). The numbers of final edited records were related to 2817, 2541 and 2701 kids for the traits considered from birth to weaning, from weaning to six months of age and from birth to six months of ages periods, respectively. Direct heritability estimates for ADG1, ADG2, ADG3, KR1, KR2, KR3, GE1, GE2 and GE3 were 0.08, 0.03, 0.06, 0.19, 0.03, 0.07, 0.07, 0.09 and 0.08, respectively. Maternal heritability estimates for ADG1, KR1 and GE1 were 0.09, 0.11 and 0.10, respectively. Genetic correlations between traits were ranged from -0.95 for ADG3-KR1 to 0.99 for ADG1-KR1, ADG2-KR2, ADG3-KR3 and KR1-GE1. Phenotypic correlations were positive and high for traits measured in the same period i.e. among ADG1, KR1 and GE1, among ADG2, KR2 and GE2 and among ADG3, KR3 and GE3; ranged from 0.77 for ADG2-GE2 to 0.96 for ADG3-KR3. The obtained results revealed little additive genetic variation in growth rate or efficiency related traits of Raeini Cashmere goat, implying little opportunity for genetic improvement of these traits in this breed through selection.
صفات مرتبط با کارایی رشد برای بهبود ژنتیکی نشخوارکنندگان کوچک به ویژه در مناطق گرمسیری با مراتع فقیر از لحاظ کمّی و کیفی، اهمیت اقتصادی دارند. از داده‌های جمع­آوری شده طی سال‌های 1376 تا 1392 در ایستگاه اصلاح نژاد بز کرکی رائینی، واقع در استان کرمان، جنوب شرقی ایران، برای تخمین پارامترهای ژنتیکی صفات افزایش وزن روزانه از تولد تا شیرگیری (ADG1)، افزایش وزن روزانه از شیرگیری تا شش ماهگی (ADG2)، افزایش وزن روزانه از تولد تا شش ماهگی (ADG3)، نسبت کلیبر از تولّد تا شیرگیری (KR1)، نسبت کلیبر از شیرگیری تا شش ماهگی (KR2)، نسبت کلیبر از تولد تا شش ماهگی (KR3)، کارایی رشد از تولد تا شیرگیری (GE1)، کارایی رشد از شیرگیری تا شش ماهگی (GE2) و کارایی رشد از تولد تا شش ماهگی (GE3) استفاده شد. تعداد رکوردهای صفات در دوره تولد تا شیرگیری، شیرگیری تا شش ماهگی و تولد تا شش ماهگی به ترتیب 2817، 2541 و 2701 رکورد بودند. وراثت­پذیری‌های مستقیم صفات ADG1، ADG2، ADG3، KR1، KR2، KR3، GE1، GE2 و GE3 به ترتیب 08/0، 03/0، 06/0، 19/0، 03/0، 07/0، 07/0، 09/0 و 08/0 برآورد شدند. وراثت­پذیری‌های مادری صفات ADG1، KR1 و GE1 به ترتیب 09/0، 11/0 و 10/0 برآورد شدند. همبستگی‌های ژنتیکی بین صفات از 95/0- بین ADG3 و KR1 تا 99/0 بین ADG1 و KR1، ADG2 و KR2، ADG3 و KR3، KR1 و GE1 متغیر بودند. همبستگی‌های فنوتیپی بین صفات هر دوره مثبت و زیاد بودند و از 77/0 بین ADG2 و GE2 تا 96/0 بین ADG3 و KR3 متغیّر بودند. نتایج حاصل نشان داد که به دلیل تنوع کم ژنتیکی افزایشی در صفات نرخ و کارایی رشد انتخاب مستقیم برای بهبود زنتیکی این صفات کارآمد نیست.
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