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Registro Completo |
Biblioteca(s): |
Embrapa Pecuária Sudeste. |
Data corrente: |
19/10/2018 |
Data da última atualização: |
11/01/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
SCALEZ, D. C. B.; FRAGOMENI, B. de O.; SANTOS, D. C. C. dos; PASSAFARO, T. L.; ALENCAR, M. M. de; TORAL. F. L. B. |
Afiliação: |
Daiane Cristina Becker Scalez, UFMT; Breno de Oliveira Fragomeni, UFMG; Dalinne Chrystian Carvalho dos Santos, UFMG; Tiago Luciano Passafaro, UFMG; MAURICIO MELLO DE ALENCAR, CPPSE; Fabio Luiz Buranelo Toral, UFMG. |
Título: |
Random regression models with B-splines to estimate genetic parameters for body weight of young bulls in performance tests. |
Ano de publicação: |
2018 |
Fonte/Imprenta: |
Revista Brasileira de Zootecnia, v. 47, p. 1-9, 2018. |
DOI: |
10.1590/rbz4720150300 |
Idioma: |
Inglês |
Conteúdo: |
The objective of this study was to estimate genetic parameters for body weight of beef cattle in performance tests. Different random regression models with quadratic B-splines and heterogeneous residual variance were fitted to estimate covariance functions for body weights of Nellore and crossbred Charolais × Nellore bulls. The criteria −2 residual log-likelihood (−2RLL), Akaike Information Criterion (AIC), and consistent AIC (CAIC) were used to choose the most appropriate model. For Nellore bulls, residual variance was modeled with six classes of age, and direct additive genetic and permanent environment effects were modeled with quadratic B-splines with two and one intervals, respectively. For crossbred bulls, quadratic B-splines with one interval fitted direct additive genetic and permanent environment effects and nine classes of age were needed to fit residual variance. Pooling classes of age with up to 40% in difference of residual variances does not compromise the fit of the model. Heritability for body weight in performance tests are moderate (>0.25, for crossbred bulls) to high (>0.5, for Nellore bulls) and genetic correlation between weights over the test are also high (>0.65). Then, selection of young bulls in performance test is an efficient tool to increase body weight in beef cattle. |
Palavras-Chave: |
Bovinos de corte. |
Thesagro: |
Gado de Corte. |
Thesaurus Nal: |
Animal breeding; Beef cattle; Genetic correlation. |
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/184758/1/RamdomRegressionModels.pdf
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Marc: |
LEADER 02136naa a2200253 a 4500 001 2097795 005 2019-01-11 008 2018 bl uuuu u00u1 u #d 024 7 $a10.1590/rbz4720150300$2DOI 100 1 $aSCALEZ, D. C. B. 245 $aRandom regression models with B-splines to estimate genetic parameters for body weight of young bulls in performance tests.$h[electronic resource] 260 $c2018 520 $aThe objective of this study was to estimate genetic parameters for body weight of beef cattle in performance tests. Different random regression models with quadratic B-splines and heterogeneous residual variance were fitted to estimate covariance functions for body weights of Nellore and crossbred Charolais × Nellore bulls. The criteria −2 residual log-likelihood (−2RLL), Akaike Information Criterion (AIC), and consistent AIC (CAIC) were used to choose the most appropriate model. For Nellore bulls, residual variance was modeled with six classes of age, and direct additive genetic and permanent environment effects were modeled with quadratic B-splines with two and one intervals, respectively. For crossbred bulls, quadratic B-splines with one interval fitted direct additive genetic and permanent environment effects and nine classes of age were needed to fit residual variance. Pooling classes of age with up to 40% in difference of residual variances does not compromise the fit of the model. Heritability for body weight in performance tests are moderate (>0.25, for crossbred bulls) to high (>0.5, for Nellore bulls) and genetic correlation between weights over the test are also high (>0.65). Then, selection of young bulls in performance test is an efficient tool to increase body weight in beef cattle. 650 $aAnimal breeding 650 $aBeef cattle 650 $aGenetic correlation 650 $aGado de Corte 653 $aBovinos de corte 700 1 $aFRAGOMENI, B. de O. 700 1 $aSANTOS, D. C. C. dos 700 1 $aPASSAFARO, T. L. 700 1 $aALENCAR, M. M. de 700 1 $aTORAL. F. L. B. 773 $tRevista Brasileira de Zootecnia$gv. 47, p. 1-9, 2018.
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Embrapa Pecuária Sudeste (CPPSE) |
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2. | | ALENCAR, M. M. de. Avaliação do gado Canchim e de seus cruzamentos. In: PUIGNAU, J. P. (Ed.). Evaluación y elección de biotipos de acuerdo a los sistemas de producción. Montevideo (Uruguay): IICA/PROCISUR, 1993. p.303-316. (Dialogo IICA-PROCISUR, 35).Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Pecuária Sudeste. |
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5. | | ALENCAR, M. M. de. Canchim. Tribuna Pecuarista, v. 1, n. 6, p. 21-22, 1986.Tipo: Artigo de Divulgação na Mídia |
Biblioteca(s): Embrapa Pecuária Sudeste. |
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6. | | ALENCAR, M. M. de. The Canchim beef cattle breed. In: GLOBAL CONFERENCE ON CONSERVATION OF DOMESTIC ANIMAL GENETICO, RESOURCES, 15., 2000, Brasilia, DF. Conservation and Biotecnology: a balanced approach for the new millenirium. Proceedings... Brasilia: Embrapagenetic resources and Biotechonology, 2000. 5 p. ResumoTipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Pecuária Sudeste. |
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9. | | ALENCAR, M. M. de. Cruzamento em gado de corte. In: CONGRESSO BRASILEIRO DE ZOOTECNIA, 17.; CONGRESSO INTERNACIONAL DE ZOOTECNIA 4.; REUNIÃO NACIONAL DE ENSINO DE ZOOTECNIA; FÓRUM DE ENTIDADES DE ZOOTECNIA 30.; FÓRUM DE COORDENADORES DE CURSOS DE ZOOTECNIA DAS UNIVERSIDADES BRASILEIRAS, 3. 2007, Londrina, PR. Anais... Londrina: Universidade Estadual de Londrina; Associação Brasileira Zootecnia, 2007.Tipo: Artigo em Anais de Congresso / Nota Técnica |
Biblioteca(s): Embrapa Pecuária Sudeste. |
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16. | | ALENCAR, M. M. de. Critérios de seleção de bovinos de corte. In: CURSO DE MELHORAMENTO DE GADO DE CORTE DA EMBRAPA - GENEPLUS, 11., 2004, Campo Grande, MS. Campo Grande: Embrapa Gado de Corte: Geneplus; São Carlos: Embrapa Pecuária Sudeste, 2004. 12 p.Tipo: Artigo em Anais de Congresso |
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