نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانش آموخته کارشناسی ارشد اصلاح نژاد دام، گروه علوم دامی ، دانشگاه زابل، زابل، ایران
2 هیات علمی دانشگاه زابل، تخصص: ژنتیک و اصلاح نژاد دام/ ژنتیک کمی/ ژنومیکس و انتخاب ژنومیک/ مکانیابی ژنی
3 دانشیار ژنتیک و اصلاح دام، گروه علوم دامی، دانشگاه زابل، زابل، ایران
4 استادیار ژنتیک و اصلاح دام، پژوهشکده دامهای خاص، دانشگاه زابل، زابل، ایران
5 استادیار پژوهشی ژنتیک و اصلاح نژاد دام، مرکز تحقیقات کشاورزی و منابع طبیعی، خراسان رضوی، مشهد، ایران
چکیده
این تحقیق با هدف مقایسه مدلهای مختلف برای برآورد پارامترهای ژنتیکی مستقیم و مادری و همچنین برآورد روند ژنتیکی برای صفات وزن بدن گوسفند کردی شمال خراسان انجام شد. از رکوردهای وزن تولد (7345 رکورد)، وزن سه (5905 رکورد)، شش (5294 رکورد)، نه (3800 رکورد) و یکسالگی (3863 رکورد) در طی سالهای 1368 تا 1391 که توسط مرکز اصلاح نژاد شهرستان شیروان جمعآوری شده بود، استفاده گردید. برآورد پارامترهای ژنتیکی صفات مختلف با شش مدل دام و نرمافزار ThrGibbsf90انجام گرفت. بهترین مدل با استفاده از معیار انحراف اطلاعات (DIC) انتخاب شد. وراثتپذیری مستقیم صفات وزن تولد، سه، شش، نه و یکسالگی به ترتیب (0007/0±)172/0، (0007/0(±257/0، (0006/0(±351/0، (0007/0(±120/0 و (0009/0(±131/0 بودند.اثر ژنتیکی مادری برای صفات وزن تولد، سه و شش ماهگی معنیدار بود (01/0P<) و نسبت واریانس محیط دائمی مادری به واریانس فنوتیپی از 055/0 (یکسالگی) تا 186/0 (تولد) متفاوت بود. اگرچه مقادیر وراثتپذیری مادری وزن بدن در سنین بیشتر از وزن تولد کمتر بود، ولی برازش اثرات تصادفی مادری (ژنتیک افزایشی و محیطی دائمی مادر) در مدل دام سبب برآورد دقیقتر پارامترهای ژنتیکی صفات مورد بررسی گردید. روند فنوتیپی صفات وزن تولد، سه، شش، نه و یک سالگی به ترتیب 4/8، 6/74، 3/8، 3/54 و 25/78 گرم در سال و روند ژنتیکی مستقیم برای این صفات به ترتیب 07/0-، 2/14، 9/21-، 7/13 و 9/24 گرم در سال برآورد شد. بنابراین، نتایج برآوردهای بیزی نشان داد که قابل اعتمادتر از روشهای آماری مرسوم هستند.
کلیدواژهها
عنوان مقاله [English]
Estimation of genetic parameters and trends for body weight traits in age’s birth to yearling in Kurdi sheep of North Khorasan
نویسندگان [English]
- Mohadeseh Namvar 1
- Gholam Reza Dashab 2
- Mohammad Rokouei 3
- Hadi Faraji Arogh 4
- Davoud Ali Saghi 5
1 MSc. of Animal Breeding, Department of Animal Science, University of Zabol, Zabol, Iran
2 Assistant Professor of genetic and Animal Breeding, Department of Animal Science, University of Zabol, Zabol, Iran.
3 Associate professor of Genetic and Animal Breeding, Department of Animal Science, University of Zabol, Zabol, Iran
4 Assistant professor of Genetic and Animal Breeding, Research Center of Special Domestic Animals, University of Zabol, Zabol, Iran
5 Assistant Researcher of Genetic and Animal Breeding, Agricultural and Neutral Resource Center, Khorasan Razavi, Mashhad, Iran.
چکیده [English]
This study was performed to compare different models for estimation of direct and maternal heritability and also for obtaining of genetic trend for body weight traits in Kurdi sheep of North Khorasan. The records of body weight in birth (BW, 7345 records), 3-month (3W, 5905 records), 6-month (6W ,5294 records), 9-month (9W, 3800 records) and 12-month (12W, 3863 records) weight that collected during 1990 to 2013 by Sheep Breeding Station of Shirvan were used. Estimation of genetic parameters for different traits by using of six animal models was carried out by ThrGibbsf90 software. The most suitable model for each trait was determined based on Deviance Information Criterion (DIC). The estimates of direct heritability for BW, 3W, 6W, 9W and 12W traits were 0.172± 0.0007, .0.257± 0.0007, 0.351± 0.0006, 0.120± 0.0007 and 0.131± 0.0009, respectively. In this study, the material genetic effect was significant for BW, 3W and 6W traits (P<0.01) and proportion of maternal permanent environmental variance to phenotypic variance was varied from 0.055 (12W) to 0.186 (BW). Although estimated heritability of maternal effects for body weight was lower in older ages, the result of this study showed that including maternal effects (maternal genetic and permanent environmental effect) in the statistical model could lead to more accurate estimation of genetic parameters for growth traits in all ages. The phenotypic trend for BW, 3W, 6W, 9W and 12W were 8.4, 74.6, 8.3, 54.3, 78.3 gr/year, respectively and direct additive genetic trend for mentioned traits were -0.07, 14.2, -21.9, 13.7, 24.9 gr/year, respectively. Therefore, the results of bayesian analysis are more reliable than convientioal statistical methods.
کلیدواژهها [English]
- Animal model
- Bayesian estimation
- heritability
- Maternal effect
- Model fitting
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