Genetic parameter estimates for growth traits in Horro sheep
Variance components and genetic parameters were estimated for growth traits: birth weight (BWT), weaning weight (WWT), 6-month weight (6MWT) and yearling weight (YWT) in indigenous Ethiopian Horro sheep using the average information REML (AIREML). Four different models: sire model (Model 1), direct...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Wiley
2002
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| Online Access: | https://hdl.handle.net/10568/32974 |
| _version_ | 1855540836322770944 |
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| author | Abegaz, Solomon Negussie, E. Duguma, G. Rege, J.E.O. |
| author_browse | Abegaz, Solomon Duguma, G. Negussie, E. Rege, J.E.O. |
| author_facet | Abegaz, Solomon Negussie, E. Duguma, G. Rege, J.E.O. |
| author_sort | Abegaz, Solomon |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Variance components and genetic parameters were estimated for growth traits: birth weight (BWT), weaning weight (WWT), 6-month weight (6MWT) and yearling weight (YWT) in indigenous Ethiopian Horro sheep using the average information REML (AIREML). Four different models: sire model (Model 1), direct animal model (model 2), direct and maternal animal model (model 3) and direct-maternal animal model including the covariance between direct and maternal effects (model 4) were used. Bivariate analysis by model 2 was also used to estimate genetic correlation between traits. Estimates of direct heritability obtained from models 1-4, respectively, were for BWT 0.25, 0.27, 0.18 and 0.32; for WWT, 0.16, 0.26, 0.1 and 0.14; for 6MWT 0.7, 0.26, 0.16 and 0.16; and for YWT 0.30, 0.28, 0.23, and 0.31. Maternal heritability estimates of 0.12 and 0.23 for BWT; 0.19 and 0.24 for WWT; 0.9 and 0.09 for 6 MWT and 0.98 and 0.14 for YWT were obtained from models 3 and 4, respectively. The correlations between direct and maternal additive genetic effects for BWT, WWT, 6MWT and YWT were -0.64, -0.42, 0.002 and -0.46, respectively. On the other hand, the genetic correlations between BWT and the rest of growth traits (WWT, 6MWT and YWT, respectively) were 0.45, 0.33 and 0.31, whereas correlations between WWT and 6MWT, WWT and YWT and 6MWT and YWT were 0.98, 0.84 and 0.87, respectively. The medium to high direct and maternal heritability estimates obtained for BWT and YWT indicate that in Horro sheep faster genetic improvement through selection is possible for these traits and it should consider both (direct and maternal) b2 estimates. However, since the direct-maternal genetic covariances were found to be negative, caution should be made in making selection decisions. The high genetic correlation among early growth traits imply that genetic improvement in any one of the traits could be made through indirect selection for correlated traits. |
| format | Journal Article |
| id | CGSpace32974 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2002 |
| publishDateRange | 2002 |
| publishDateSort | 2002 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace329742023-12-27T20:01:20Z Genetic parameter estimates for growth traits in Horro sheep Abegaz, Solomon Negussie, E. Duguma, G. Rege, J.E.O. sheep genetic parameters growth herd management phenotypes genotypes models Variance components and genetic parameters were estimated for growth traits: birth weight (BWT), weaning weight (WWT), 6-month weight (6MWT) and yearling weight (YWT) in indigenous Ethiopian Horro sheep using the average information REML (AIREML). Four different models: sire model (Model 1), direct animal model (model 2), direct and maternal animal model (model 3) and direct-maternal animal model including the covariance between direct and maternal effects (model 4) were used. Bivariate analysis by model 2 was also used to estimate genetic correlation between traits. Estimates of direct heritability obtained from models 1-4, respectively, were for BWT 0.25, 0.27, 0.18 and 0.32; for WWT, 0.16, 0.26, 0.1 and 0.14; for 6MWT 0.7, 0.26, 0.16 and 0.16; and for YWT 0.30, 0.28, 0.23, and 0.31. Maternal heritability estimates of 0.12 and 0.23 for BWT; 0.19 and 0.24 for WWT; 0.9 and 0.09 for 6 MWT and 0.98 and 0.14 for YWT were obtained from models 3 and 4, respectively. The correlations between direct and maternal additive genetic effects for BWT, WWT, 6MWT and YWT were -0.64, -0.42, 0.002 and -0.46, respectively. On the other hand, the genetic correlations between BWT and the rest of growth traits (WWT, 6MWT and YWT, respectively) were 0.45, 0.33 and 0.31, whereas correlations between WWT and 6MWT, WWT and YWT and 6MWT and YWT were 0.98, 0.84 and 0.87, respectively. The medium to high direct and maternal heritability estimates obtained for BWT and YWT indicate that in Horro sheep faster genetic improvement through selection is possible for these traits and it should consider both (direct and maternal) b2 estimates. However, since the direct-maternal genetic covariances were found to be negative, caution should be made in making selection decisions. The high genetic correlation among early growth traits imply that genetic improvement in any one of the traits could be made through indirect selection for correlated traits. 2002-02 2013-07-03T05:25:51Z 2013-07-03T05:25:51Z Journal Article https://hdl.handle.net/10568/32974 en Limited Access Wiley Journal of Animal Breeding and Genetics;119(1): 35-45 |
| spellingShingle | sheep genetic parameters growth herd management phenotypes genotypes models Abegaz, Solomon Negussie, E. Duguma, G. Rege, J.E.O. Genetic parameter estimates for growth traits in Horro sheep |
| title | Genetic parameter estimates for growth traits in Horro sheep |
| title_full | Genetic parameter estimates for growth traits in Horro sheep |
| title_fullStr | Genetic parameter estimates for growth traits in Horro sheep |
| title_full_unstemmed | Genetic parameter estimates for growth traits in Horro sheep |
| title_short | Genetic parameter estimates for growth traits in Horro sheep |
| title_sort | genetic parameter estimates for growth traits in horro sheep |
| topic | sheep genetic parameters growth herd management phenotypes genotypes models |
| url | https://hdl.handle.net/10568/32974 |
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