Genetic and environmental effects on sexual precocity traits in Nellore cattle

Detalhes bibliográficos
Autor(a) principal: Meirelles, Sarah Laguna
Data de Publicação: 2009
Outros Autores: Espasandin, Ana Carolina, Mattar, Maira, Queiroz, Sandra Aidar de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/41898
Resumo: The objective of this study was to estimate the heritability of probability of early pregnancy (PEP) and scrotal circumference (SC) and the genetic correlation between these traits in Nellore cattle. PEP records from 11,696 Nellore females born between 1983 and 2001 were analyzed. PEP was assumed to be one for females that effectively bred in the herd (19.84%) and zero for those discarded before first calving (80.16%). The model used to study PEP included the effects of contemporary group, age of dam at calving and heifer weaning age, direct additive genetic effects, and residual effects. For SC, 9335 records were analyzed considering the effect of contemporary group, direct additive genetic effects and residual effects. Covariance components were estimated by Gibbs sampling applied to a two-trait sire model, using a threshold model for PEP and a linear model for SC. Estimated mean heritability was 0.47 ± 0.05 for PEP and 0.27 ± 0.03 for SC, and the genetic correlation between traits was 0.12 ± 0.20. These results indicated the existence of additive genetic variation for PEP and this trait should therefore respond to selection. The estimated genetic correlation between PEP and SC indicated a low, but favorable, association. Thus, SC might be used together with PEP in genetic evaluations of sexual precocity. This procedure would increase the accuracy of predicting expected progeny differences for PEP.
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spelling Genetic and environmental effects on sexual precocity traits in Nellore cattleBeef cattleEarly pregnancyScrotal circumferenceThreshold traitThe objective of this study was to estimate the heritability of probability of early pregnancy (PEP) and scrotal circumference (SC) and the genetic correlation between these traits in Nellore cattle. PEP records from 11,696 Nellore females born between 1983 and 2001 were analyzed. PEP was assumed to be one for females that effectively bred in the herd (19.84%) and zero for those discarded before first calving (80.16%). The model used to study PEP included the effects of contemporary group, age of dam at calving and heifer weaning age, direct additive genetic effects, and residual effects. For SC, 9335 records were analyzed considering the effect of contemporary group, direct additive genetic effects and residual effects. Covariance components were estimated by Gibbs sampling applied to a two-trait sire model, using a threshold model for PEP and a linear model for SC. Estimated mean heritability was 0.47 ± 0.05 for PEP and 0.27 ± 0.03 for SC, and the genetic correlation between traits was 0.12 ± 0.20. These results indicated the existence of additive genetic variation for PEP and this trait should therefore respond to selection. The estimated genetic correlation between PEP and SC indicated a low, but favorable, association. Thus, SC might be used together with PEP in genetic evaluations of sexual precocity. This procedure would increase the accuracy of predicting expected progeny differences for PEP.Sociedade Brasileira de Zootecnia (SBZ)2020-07-13T12:50:19Z2020-07-13T12:50:19Z2009-08info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfMEIRELLES, S. L. et al. Genetic and environmental effects on sexual precocity traits in Nellore cattle. Revista Brasileira de Zootecnia, Viçosa, MG, v. 38, n. 8, p. 1488-1493, Aug. 2009. DOI: 10.1590/S1516-35982009000800012.http://repositorio.ufla.br/jspui/handle/1/41898Revista Brasileira de Zootecnia (RBZ)reponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccessMeirelles, Sarah LagunaEspasandin, Ana CarolinaMattar, MairaQueiroz, Sandra Aidar deeng2020-07-13T12:50:19Zoai:localhost:1/41898Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2020-07-13T12:50:19Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Genetic and environmental effects on sexual precocity traits in Nellore cattle
title Genetic and environmental effects on sexual precocity traits in Nellore cattle
spellingShingle Genetic and environmental effects on sexual precocity traits in Nellore cattle
Meirelles, Sarah Laguna
Beef cattle
Early pregnancy
Scrotal circumference
Threshold trait
title_short Genetic and environmental effects on sexual precocity traits in Nellore cattle
title_full Genetic and environmental effects on sexual precocity traits in Nellore cattle
title_fullStr Genetic and environmental effects on sexual precocity traits in Nellore cattle
title_full_unstemmed Genetic and environmental effects on sexual precocity traits in Nellore cattle
title_sort Genetic and environmental effects on sexual precocity traits in Nellore cattle
author Meirelles, Sarah Laguna
author_facet Meirelles, Sarah Laguna
Espasandin, Ana Carolina
Mattar, Maira
Queiroz, Sandra Aidar de
author_role author
author2 Espasandin, Ana Carolina
Mattar, Maira
Queiroz, Sandra Aidar de
author2_role author
author
author
dc.contributor.author.fl_str_mv Meirelles, Sarah Laguna
Espasandin, Ana Carolina
Mattar, Maira
Queiroz, Sandra Aidar de
dc.subject.por.fl_str_mv Beef cattle
Early pregnancy
Scrotal circumference
Threshold trait
topic Beef cattle
Early pregnancy
Scrotal circumference
Threshold trait
description The objective of this study was to estimate the heritability of probability of early pregnancy (PEP) and scrotal circumference (SC) and the genetic correlation between these traits in Nellore cattle. PEP records from 11,696 Nellore females born between 1983 and 2001 were analyzed. PEP was assumed to be one for females that effectively bred in the herd (19.84%) and zero for those discarded before first calving (80.16%). The model used to study PEP included the effects of contemporary group, age of dam at calving and heifer weaning age, direct additive genetic effects, and residual effects. For SC, 9335 records were analyzed considering the effect of contemporary group, direct additive genetic effects and residual effects. Covariance components were estimated by Gibbs sampling applied to a two-trait sire model, using a threshold model for PEP and a linear model for SC. Estimated mean heritability was 0.47 ± 0.05 for PEP and 0.27 ± 0.03 for SC, and the genetic correlation between traits was 0.12 ± 0.20. These results indicated the existence of additive genetic variation for PEP and this trait should therefore respond to selection. The estimated genetic correlation between PEP and SC indicated a low, but favorable, association. Thus, SC might be used together with PEP in genetic evaluations of sexual precocity. This procedure would increase the accuracy of predicting expected progeny differences for PEP.
publishDate 2009
dc.date.none.fl_str_mv 2009-08
2020-07-13T12:50:19Z
2020-07-13T12:50:19Z
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 MEIRELLES, S. L. et al. Genetic and environmental effects on sexual precocity traits in Nellore cattle. Revista Brasileira de Zootecnia, Viçosa, MG, v. 38, n. 8, p. 1488-1493, Aug. 2009. DOI: 10.1590/S1516-35982009000800012.
http://repositorio.ufla.br/jspui/handle/1/41898
identifier_str_mv MEIRELLES, S. L. et al. Genetic and environmental effects on sexual precocity traits in Nellore cattle. Revista Brasileira de Zootecnia, Viçosa, MG, v. 38, n. 8, p. 1488-1493, Aug. 2009. DOI: 10.1590/S1516-35982009000800012.
url http://repositorio.ufla.br/jspui/handle/1/41898
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv Attribution-NonCommercial 4.0 International
http://creativecommons.org/licenses/by-nc/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial 4.0 International
http://creativecommons.org/licenses/by-nc/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Sociedade Brasileira de Zootecnia (SBZ)
publisher.none.fl_str_mv Sociedade Brasileira de Zootecnia (SBZ)
dc.source.none.fl_str_mv Revista Brasileira de Zootecnia (RBZ)
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
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