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اثر عوامل ژنتیکی و غیر ژنتیکی موثر بر زنده مانی از تولد تا یک سالگی بره های کردی | ||
| علوم دامی | ||
| مقاله 7، دوره 29، شماره 112، آذر 1395، صفحه 65-78 اصل مقاله (2.36 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/asj.2016.107421 | ||
| نویسنده | ||
| داودعلی ساقی* | ||
| استادیار مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی خراسان رضوی | ||
| چکیده | ||
| به منظور بررسی اثر عوامل ژنتیکی و غیر ژنتیکی موثر بر صفات طول عمر و زنده‌مانی در بره های کردی از رکوردهای جمع‌آوری شده توسط ایستگاه پرورش و اصلاح نژاد گوسفندکردی شیروان طی سال-های 91-69 که شامل 7469 حیوان حاصل از187 پدر و 2258 مادر بودند، استفاده شد. عوامل ثابت جنس بره، نوع تولد، ماه تولد، سن مادر، سال تولد و متغیر کمی وزن تولد بر صفات مورد بررسی تاثیر معنی داری داشتند (01/0>P). میزان وراثت پذیری طول عمر بره ها، حاصل از مدل های خطی مختلف در حد پایین بین 01/0 تا 06/0 برآورد شد. نتایج آزمون نسبت درستنمایی نشان داد که مدل3 که افزون بر اثر تصادفی ژنتیک افزایشی حیوان دارای دو اثر تصادفی مادری نیز می باشد برای برآورد مولفه های واریانس و پارامترهای ژنتیکی صفت طول عمر از تولد تا یک سالگی مناسب می باشد. میزان وراثت پذیری مستقیم زنده مانی بره ها، حاصل از مدل های خطی مختلف در دامنه بین صفر تا 046/0 برآورد گردید. آزمون نسبت درستنمایی نشان داد که برای برآورد مولفه های واریانس و پارامترهای ژنتیکی زنده مانی بره ها از تولد تا یک سالگی، مدل1 مناسب ترین مدل می باشد. مقادیر وراثت پذیری لگاریتمی، وراثت پذیری اولیه و وراثت پذیری موثر حاصل از مدل پدری برای زنده مانی از تولد تا یک سالگی بره های کردی به ترتیب در دامنه (04/0 تا 09/0)، (21/0 تا 41/0) و (07/0 تا 16/0) برآورد گردید که بیشترین میزان آنها مربوط به زنده مانی در سن 2 ماهگی مشاهده شد. | ||
| کلیدواژه‌ها | ||
| طول عمر تولیدی؛ زنده مانی؛ گوسفند کردی؛ وراثت پذیری | ||
| عنوان مقاله [English] | ||
| The effects of genetic and non genetic factors on survival and longevity of Kourdi lambs from birth to yearling | ||
| نویسندگان [English] | ||
| Davoud Ali Saghi | ||
| چکیده [English] | ||
| The effect of genetic and non genetic factors on length of life and survival records of Kourdi lambs, 7469 records collected from 1988 to 2011 in Hossin Abad Sheep Breeding Station in Shirvan were used in this study that which belonging to 187 sire and 2258 dam. Data were analysed using linear models with included fixed effects of year and month and type of birth, sex of lamb, age of dam and lamb's birth weight as linear and quadratic covariate, and direct additive genetic, maternal additive genetic, maternal common environmental and residual random effects. Overall mean of length of life and cumulative survival rate up to yearling were 274.3 ± 165.3 days and 0.62 ± 0.26 percent. The effect of year, month, type of birth, birth weight and sex of lamb were significant on length of life and survival from birth to yearling. Male lambs had lower life length and survival rate than females in all ages. With increasing birth weight survival rate decreased. The direct heritabilities of length of life and survival rate estimated from different linear models were low (0.01 to 0.006). The maternal heritability ranged from zero to 0.02. The estimates of heritability in logarithmic, original and effective scale obtained from sire model with weibull function were higher than values estimated by different linear models. Estimated heritability for length of productive life was 0.013 and genetic correlation between satiability traits were high and positive. | ||
| کلیدواژه‌ها [English] | ||
| Length of productive life, survival, Kourdi sheep, heritability | ||
| مراجع | ||
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