Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle
<p>Abstract</p> <p>Background</p> <p>Many studies have provided evidence of the existence of genetic heterogeneity of environmental variance, suggesting that it could be exploited to improve robustness and uniformity of livestock by selection. However, little is known a...
| Main Authors: | , , |
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| Format: | Article |
| Language: | deu |
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BMC
2012-07-01
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| Series: | Genetics Selection Evolution |
| Online Access: | http://www.gsejournal.org/content/44/1/19 |
| _version_ | 1811286941169090560 |
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| author | Neves Haroldo HR Carvalheiro Roberto Queiroz Sandra A |
| author_facet | Neves Haroldo HR Carvalheiro Roberto Queiroz Sandra A |
| author_sort | Neves Haroldo HR |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>Many studies have provided evidence of the existence of genetic heterogeneity of environmental variance, suggesting that it could be exploited to improve robustness and uniformity of livestock by selection. However, little is known about the perspectives of such a selection strategy in beef cattle.</p> <p>Methods</p> <p>A two-step approach was applied to study the genetic heterogeneity of residual variance of weight gain from birth to weaning and long-yearling weight in a Nellore beef cattle population. First, an animal model was fitted to the data and second, the influence of additive and environmental effects on the residual variance of these traits was investigated with different models, in which the log squared estimated residuals for each phenotypic record were analyzed using the restricted maximum likelihood method. Monte Carlo simulation was performed to assess the reliability of variance component estimates from the second step and the accuracy of estimated breeding values for residual variation.</p> <p>Results</p> <p>The results suggest that both genetic and environmental factors have an effect on the residual variance of weight gain from birth to weaning and long-yearling in Nellore beef cattle and that uniformity of these traits could be improved by selecting for lower residual variance, when considering a large amount of information to predict genetic merit for this criterion. Simulations suggested that using the two-step approach would lead to biased estimates of variance components, such that more adequate methods are needed to study the genetic heterogeneity of residual variance in beef cattle.</p> |
| first_indexed | 2024-04-13T03:08:53Z |
| format | Article |
| id | doaj.art-8d0d1101db6d4750bfe3cf86cb95dcfb |
| institution | Directory Open Access Journal |
| issn | 0999-193X 1297-9686 |
| language | deu |
| last_indexed | 2024-04-13T03:08:53Z |
| publishDate | 2012-07-01 |
| publisher | BMC |
| record_format | Article |
| series | Genetics Selection Evolution |
| spelling | doaj.art-8d0d1101db6d4750bfe3cf86cb95dcfb2022-12-22T03:05:08ZdeuBMCGenetics Selection Evolution0999-193X1297-96862012-07-014411910.1186/1297-9686-44-19Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattleNeves Haroldo HRCarvalheiro RobertoQueiroz Sandra A<p>Abstract</p> <p>Background</p> <p>Many studies have provided evidence of the existence of genetic heterogeneity of environmental variance, suggesting that it could be exploited to improve robustness and uniformity of livestock by selection. However, little is known about the perspectives of such a selection strategy in beef cattle.</p> <p>Methods</p> <p>A two-step approach was applied to study the genetic heterogeneity of residual variance of weight gain from birth to weaning and long-yearling weight in a Nellore beef cattle population. First, an animal model was fitted to the data and second, the influence of additive and environmental effects on the residual variance of these traits was investigated with different models, in which the log squared estimated residuals for each phenotypic record were analyzed using the restricted maximum likelihood method. Monte Carlo simulation was performed to assess the reliability of variance component estimates from the second step and the accuracy of estimated breeding values for residual variation.</p> <p>Results</p> <p>The results suggest that both genetic and environmental factors have an effect on the residual variance of weight gain from birth to weaning and long-yearling in Nellore beef cattle and that uniformity of these traits could be improved by selecting for lower residual variance, when considering a large amount of information to predict genetic merit for this criterion. Simulations suggested that using the two-step approach would lead to biased estimates of variance components, such that more adequate methods are needed to study the genetic heterogeneity of residual variance in beef cattle.</p>http://www.gsejournal.org/content/44/1/19 |
| spellingShingle | Neves Haroldo HR Carvalheiro Roberto Queiroz Sandra A Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle Genetics Selection Evolution |
| title | Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle |
| title_full | Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle |
| title_fullStr | Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle |
| title_full_unstemmed | Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle |
| title_short | Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle |
| title_sort | genetic and environmental heterogeneity of residual variance of weight traits in nellore beef cattle |
| url | http://www.gsejournal.org/content/44/1/19 |
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