Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1186/1297-9686-44-19 http://hdl.handle.net/11449/4672 |
Resumo: | Background: 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.Methods: 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.Results: 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. |
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Repositório Institucional da UNESP |
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Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattleBackground: 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.Methods: 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.Results: 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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNESP, FCAV, Dept Zootecnia, BR-14884900 Jaboticabal, SP, BrazilGenSys Consultores Associados SS Ltda, Porto Alegre, RS, BrazilUNESP, FCAV, Dept Zootecnia, BR-14884900 Jaboticabal, SP, BrazilBiomed Central Ltd.Universidade Estadual Paulista (Unesp)GenSys Consultores Associados SS LtdaNeves, Haroldo H. R. [UNESP]Carvalheiro, RobertoQueiroz, Sandra A. [UNESP]2014-05-20T13:18:40Z2014-05-20T13:18:40Z2012-06-06info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article12application/pdfhttp://dx.doi.org/10.1186/1297-9686-44-19Genetics Selection Evolution. London: Biomed Central Ltd., v. 44, p. 12, 2012.0999-193Xhttp://hdl.handle.net/11449/467210.1186/1297-9686-44-19WOS:000306367100001WOS000306367100001.pdf9096087557977610Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengGenetics Selection Evolution3.743info:eu-repo/semantics/openAccess2024-06-07T18:42:20Zoai:repositorio.unesp.br:11449/4672Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:40:28.880754Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle |
title |
Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle |
spellingShingle |
Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle Neves, Haroldo H. R. [UNESP] |
title_short |
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_sort |
Genetic and environmental heterogeneity of residual variance of weight traits in Nellore beef cattle |
author |
Neves, Haroldo H. R. [UNESP] |
author_facet |
Neves, Haroldo H. R. [UNESP] Carvalheiro, Roberto Queiroz, Sandra A. [UNESP] |
author_role |
author |
author2 |
Carvalheiro, Roberto Queiroz, Sandra A. [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) GenSys Consultores Associados SS Ltda |
dc.contributor.author.fl_str_mv |
Neves, Haroldo H. R. [UNESP] Carvalheiro, Roberto Queiroz, Sandra A. [UNESP] |
description |
Background: 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.Methods: 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.Results: 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. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-06-06 2014-05-20T13:18:40Z 2014-05-20T13:18:40Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1186/1297-9686-44-19 Genetics Selection Evolution. London: Biomed Central Ltd., v. 44, p. 12, 2012. 0999-193X http://hdl.handle.net/11449/4672 10.1186/1297-9686-44-19 WOS:000306367100001 WOS000306367100001.pdf 9096087557977610 |
url |
http://dx.doi.org/10.1186/1297-9686-44-19 http://hdl.handle.net/11449/4672 |
identifier_str_mv |
Genetics Selection Evolution. London: Biomed Central Ltd., v. 44, p. 12, 2012. 0999-193X 10.1186/1297-9686-44-19 WOS:000306367100001 WOS000306367100001.pdf 9096087557977610 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Genetics Selection Evolution 3.743 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
12 application/pdf |
dc.publisher.none.fl_str_mv |
Biomed Central Ltd. |
publisher.none.fl_str_mv |
Biomed Central Ltd. |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128964847206400 |