Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattle
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Semina. Ciências Agrárias (Online) |
Texto Completo: | https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/19230 |
Resumo: | The visual scores for conformation (C), precocity (P) and muscle (M) are used to indirectly assess traits related to termination and carcass composition. This study analyzes how age of dam at calving (AC), long yearling age (YA) and long yearling weight (YW) of the animal affect the scores of Nellore cattle, and estimates their heritability. Regression functions were estimated to determine the AC, YA and YW effects on C, P and M scores after the contemporary group (CG) effect being absorbed. The heritabilities were estimated by restricted maximum likelihood using four different models that included animal additive genetic effect as random and different covariates (AC, YA and YW) as fixed effects. The regression analysis showed that the covariates, either linear or quadratic, significantly influenced the scores of C, P and M. The determination coefficients of the models for YA and AC were small, probably due to the CG bias removal. The heritability estimates for the scores ranged from 0.13 to 0.36 for C; 0.32 to 0.36 for P; and, 0.35 to 0.38 for M, for all models, indicating that C, P and M respond to direct selection. The classification of animals according to their breeding values, especially in relation to C, varied according to the environmental effects included in the models. |
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Semina. Ciências Agrárias (Online) |
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Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattleEfeitos genéticos e de ambiente sobre os escores visuais de conformação, precocidade e musculosidade em bovinos Nelore ao sobreanoCalving ageGenetic evaluationHeritabilityLong yearling ageLong yearling weight.Avaliação genéticaHerdabilidadeIdade ao sobreanoIdade da vaca ao partoPeso ao sobreano.The visual scores for conformation (C), precocity (P) and muscle (M) are used to indirectly assess traits related to termination and carcass composition. This study analyzes how age of dam at calving (AC), long yearling age (YA) and long yearling weight (YW) of the animal affect the scores of Nellore cattle, and estimates their heritability. Regression functions were estimated to determine the AC, YA and YW effects on C, P and M scores after the contemporary group (CG) effect being absorbed. The heritabilities were estimated by restricted maximum likelihood using four different models that included animal additive genetic effect as random and different covariates (AC, YA and YW) as fixed effects. The regression analysis showed that the covariates, either linear or quadratic, significantly influenced the scores of C, P and M. The determination coefficients of the models for YA and AC were small, probably due to the CG bias removal. The heritability estimates for the scores ranged from 0.13 to 0.36 for C; 0.32 to 0.36 for P; and, 0.35 to 0.38 for M, for all models, indicating that C, P and M respond to direct selection. The classification of animals according to their breeding values, especially in relation to C, varied according to the environmental effects included in the models.Os escores visuais de conformação (C), precocidade (P) e musculosidade (M) são usados para acessar indiretamente características relacionadas à terminação e composição de carcaça. Neste estudo, objetivou-se analisar como a idade da vaca ao parto (AC), idade (YA) e peso do animal ao sobreano (YW) influenciam os escores de bovinos da raça Nelore, além de estimar suas herdabilidades. Foram estimadas funções de regressão dos efeitos de AC, YA e YW sobre os escores C, P e M, após a absorção do efeito de grupo de contemporâneos (CG). As herdabilidades foram estimadas por máxima verossimilhança restrita, considerando-se quatro diferentes modelos que incluíram o efeito genético aditivo de animal como aleatório, e diferentes covariáveis (AC, YA e YW) como efeitos fixos. Nas análises de regressão, as covariáveis, tanto linear como quadrática, influenciaram significativamente os escores C, P e M. Os coeficientes de determinação dos modelos para YA e AC foram de pequena magnitude, provavelmente devido à absorção do efeito de CG. As estimativas de herdabilidade para os escores variaram de 0,13 a 0,36 para C, de 0,32 a 0,36 para P, e de 0,35 a 0,38 para M, considerando todos os modelos utilizados, indicando que C, P e M respondem à seleção direta. A classificação dos animais de acordo com seus valores genéticos, principalmente em relação a C, variou de acordo com os efeitos de ambiente incluídos nos modelos.s.UEL2015-12-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionModelagem estatísticaapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/1923010.5433/1679-0359.2015v36n6Supl2p4447Semina: Ciências Agrárias; Vol. 36 No. 6Supl2 (2015); 4447-4456Semina: Ciências Agrárias; v. 36 n. 6Supl2 (2015); 4447-44561679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/19230/17565http://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessBarrozo, DiegoMattar, MairaTholon, PatríciaOliveira, João Ademir deScalez, Daiane Cristina BeckerQueiroz, Sandra Aidar de2022-12-02T15:26:36Zoai:ojs.pkp.sfu.ca:article/19230Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2022-12-02T15:26:36Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false |
dc.title.none.fl_str_mv |
Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattle Efeitos genéticos e de ambiente sobre os escores visuais de conformação, precocidade e musculosidade em bovinos Nelore ao sobreano |
title |
Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattle |
spellingShingle |
Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattle Barrozo, Diego Calving age Genetic evaluation Heritability Long yearling age Long yearling weight. Avaliação genética Herdabilidade Idade ao sobreano Idade da vaca ao parto Peso ao sobreano. |
title_short |
Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattle |
title_full |
Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattle |
title_fullStr |
Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattle |
title_full_unstemmed |
Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattle |
title_sort |
Genetic and environmental effects on scores of conformation, precocity and muscling in long yearling Nellore cattle |
author |
Barrozo, Diego |
author_facet |
Barrozo, Diego Mattar, Maira Tholon, Patrícia Oliveira, João Ademir de Scalez, Daiane Cristina Becker Queiroz, Sandra Aidar de |
author_role |
author |
author2 |
Mattar, Maira Tholon, Patrícia Oliveira, João Ademir de Scalez, Daiane Cristina Becker Queiroz, Sandra Aidar de |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Barrozo, Diego Mattar, Maira Tholon, Patrícia Oliveira, João Ademir de Scalez, Daiane Cristina Becker Queiroz, Sandra Aidar de |
dc.subject.por.fl_str_mv |
Calving age Genetic evaluation Heritability Long yearling age Long yearling weight. Avaliação genética Herdabilidade Idade ao sobreano Idade da vaca ao parto Peso ao sobreano. |
topic |
Calving age Genetic evaluation Heritability Long yearling age Long yearling weight. Avaliação genética Herdabilidade Idade ao sobreano Idade da vaca ao parto Peso ao sobreano. |
description |
The visual scores for conformation (C), precocity (P) and muscle (M) are used to indirectly assess traits related to termination and carcass composition. This study analyzes how age of dam at calving (AC), long yearling age (YA) and long yearling weight (YW) of the animal affect the scores of Nellore cattle, and estimates their heritability. Regression functions were estimated to determine the AC, YA and YW effects on C, P and M scores after the contemporary group (CG) effect being absorbed. The heritabilities were estimated by restricted maximum likelihood using four different models that included animal additive genetic effect as random and different covariates (AC, YA and YW) as fixed effects. The regression analysis showed that the covariates, either linear or quadratic, significantly influenced the scores of C, P and M. The determination coefficients of the models for YA and AC were small, probably due to the CG bias removal. The heritability estimates for the scores ranged from 0.13 to 0.36 for C; 0.32 to 0.36 for P; and, 0.35 to 0.38 for M, for all models, indicating that C, P and M respond to direct selection. The classification of animals according to their breeding values, especially in relation to C, varied according to the environmental effects included in the models. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-12-16 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Modelagem estatística |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/19230 10.5433/1679-0359.2015v36n6Supl2p4447 |
url |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/19230 |
identifier_str_mv |
10.5433/1679-0359.2015v36n6Supl2p4447 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/19230/17565 |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
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 |
UEL |
publisher.none.fl_str_mv |
UEL |
dc.source.none.fl_str_mv |
Semina: Ciências Agrárias; Vol. 36 No. 6Supl2 (2015); 4447-4456 Semina: Ciências Agrárias; v. 36 n. 6Supl2 (2015); 4447-4456 1679-0359 1676-546X reponame:Semina. Ciências Agrárias (Online) instname:Universidade Estadual de Londrina (UEL) instacron:UEL |
instname_str |
Universidade Estadual de Londrina (UEL) |
instacron_str |
UEL |
institution |
UEL |
reponame_str |
Semina. Ciências Agrárias (Online) |
collection |
Semina. Ciências Agrárias (Online) |
repository.name.fl_str_mv |
Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL) |
repository.mail.fl_str_mv |
semina.agrarias@uel.br |
_version_ |
1799306072699174912 |