کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5518345 1543952 2017 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Genetic analysis of average daily gain in Baluchi sheep
ترجمه فارسی عنوان
تجزیه و تحلیل ژنتیکی میانگین افزایش روزانه گوسفند بلوچی
کلمات کلیدی
نرخ رشد، روند ژنتیکی، وراثت، گوسفند بلوچی،
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوشیمی، ژنتیک و زیست شناسی مولکولی (عمومی)
چکیده انگلیسی


- Direct heritability estimates ranged from 0.03 (ADGa) to 0.11 (ADGb).
- Negative genetic correlations were observed for BW-ADGb and BW-ADGc.
- Phenotypic correlations ranged from − 0.49 (BW-ADGb) to 0.88 (WW-ADGa).
- Annual genetic gains (g/year) for ADGa, ADGb and ADGc were 0.02, 0.02 and 0.04, respectively.

The objective of the present study was to estimate genetic parameters and genetic trends for average daily gain (growth rate) and to investigate the genetic effect of body weight at different ages (birth (BW), weaning (WW), 6 months (W6) and 9 months (W9)) on growth rate of Baluchi sheep. Data were collected at the Abbasabad Baluchi Sheep Breeding Station (flock 2) from 1983 to 2009. Traits were average daily gain from birth to weaning (ADGa), from weaning to 6 months of age (ADGb) and from weaning to 9 months of age (ADGc). (Co) variance components and genetic parameters were estimated by univariate and multivariate animal models using Restricted Maximum Likelihood (REML) procedure. Genetic improvements over analyze were calculated as the differences between the means of estimated breeding values at the beginning and at the end of analyze. Genetic trends were obtained by regressing the means of predicted breeding values on year of birth for each trait. Direct heritability estimates were, correspondingly, 0.03, 0.11 and 0.05 for ADGa, ADGb and ADGc. Estimate of maternal heritability (m2) for ADGc was 0.11. Estimated value of maternal permanent environment variance as a proportion of phenotypic variance (c2) was 0.14 for ADGa. Negative genetic correlations were observed for BW-ADGb and BW-ADGc. Direct additive genetic correlations between traits ranged from − 0.63 (BW-ADGc) to 0.91 (W9-ADGc). Phenotypic correlations ranged from − 0.49 (BW-ADGb) to 0.88 (WW-ADGa). Maternal permanent environmental correlations ranged between 0.13 (W9-ADGa) to 0.99 (WW-ADGa). Genetic improvements were 0.033 g, 0.36 g and 0.31 g for ADGa, ADGb and ADGc, respectively. Annual genetic gains (g/year) for ADGa, ADGb and ADGc, were 0.02, 0.03 and 0.04, respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Meta Gene - Volume 13, September 2017, Pages 119-123
نویسندگان
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