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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
14/01/2019 |
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Data da última atualização: |
24/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
AZEVEDO JUNIOR, J.; GONÇALVES, T. de M.; SOUZA, J. C. de; RODRIGUEZ, M. A. P.; COSTA, C. N.; CARVALHEIRA, J. G. V. |
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Afiliação: |
Jairo Azevedo Junior, UFLA; Tarcisio de Moraes Gonçalves, UFLA; José Camisão de Souza, UFLA; Mary Ana Petersen Rodriguez, Universidade Estadual de Montes Claros; CLAUDIO NAPOLIS COSTA, CNPGL; Julio Gil Vale Carvalheira, Universidade do Porto, Portugal. |
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Título: |
Adjustment of lactation curves of Holstein cows from herds of Minas Gerais, Brazil. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Journal of Agricultural Science, v. 10, n. 2, 2018. |
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Páginas: |
14 p. |
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DOI: |
10.5539/jas.v10n2p1 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract Random regression models (RRM) differ in terms of the functions used to describe the shape of lactation curves. The aim was to compare random regression models under different functions to describe the lactation curves from Holstein cows in herds of the state of Minas Gerais. A database of 28,118 production records was analyzed using the test-day records of 4,230 first parity cows from five herds. The Wilmink, Ali & Schaeffer and Legendre polynomial (orders 4, 5 and 6) functions were adjusted in RRM to model the mean production trend (fixed) and genetic and permanent environmental (random) effects. The residual variances were assumed to be constant throughout lactation. Analyses were performed using the AIREMLF90 program. Except for the model with the polynomial function of order 5, all models converged. The Wilmink function showed lower values for criteria based on the -2log (L), AIC and BIC. The model with the Legendre polynomial of order 6 showed lower residual variance. Heritability estimates were similar between functions, ranging from 0.07 to 0.18 and were higher from 215 days of lactation. From 155 days of lactation, genetic and permanent environmental correlations between successive controls are of high magnitude. The Wilmink function is the most suitable for the study of milk yields from primiparous Holstein cows. The selection of animals is possible from 155 days of lactation on. Permanent environmental effects have greater influence on the milk production at the end of lactation of primiparous cows and should be considered since they are important and may be cumulative throughout lactation. MenosAbstract Random regression models (RRM) differ in terms of the functions used to describe the shape of lactation curves. The aim was to compare random regression models under different functions to describe the lactation curves from Holstein cows in herds of the state of Minas Gerais. A database of 28,118 production records was analyzed using the test-day records of 4,230 first parity cows from five herds. The Wilmink, Ali & Schaeffer and Legendre polynomial (orders 4, 5 and 6) functions were adjusted in RRM to model the mean production trend (fixed) and genetic and permanent environmental (random) effects. The residual variances were assumed to be constant throughout lactation. Analyses were performed using the AIREMLF90 program. Except for the model with the polynomial function of order 5, all models converged. The Wilmink function showed lower values for criteria based on the -2log (L), AIC and BIC. The model with the Legendre polynomial of order 6 showed lower residual variance. Heritability estimates were similar between functions, ranging from 0.07 to 0.18 and were higher from 215 days of lactation. From 155 days of lactation, genetic and permanent environmental correlations between successive controls are of high magnitude. The Wilmink function is the most suitable for the study of milk yields from primiparous Holstein cows. The selection of animals is possible from 155 days of lactation on. Permanent environmental effects have greater influence on the milk production... Mostrar Tudo |
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Palavras-Chave: |
Models comparison; Permanent environmental effects; Random regression model. |
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Thesaurus Nal: |
Dairy cattle; Heritability. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/190401/1/Artigo-JAgrSci-Claudio-Adjustment.pdf
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Marc: |
LEADER 02438naa a2200265 a 4500
001 2103873
005 2023-01-24
008 2018 bl uuuu u00u1 u #d
024 7 $a10.5539/jas.v10n2p1$2DOI
100 1 $aAZEVEDO JUNIOR, J.
245 $aAdjustment of lactation curves of Holstein cows from herds of Minas Gerais, Brazil.$h[electronic resource]
260 $c2018
300 $a14 p.
520 $aAbstract Random regression models (RRM) differ in terms of the functions used to describe the shape of lactation curves. The aim was to compare random regression models under different functions to describe the lactation curves from Holstein cows in herds of the state of Minas Gerais. A database of 28,118 production records was analyzed using the test-day records of 4,230 first parity cows from five herds. The Wilmink, Ali & Schaeffer and Legendre polynomial (orders 4, 5 and 6) functions were adjusted in RRM to model the mean production trend (fixed) and genetic and permanent environmental (random) effects. The residual variances were assumed to be constant throughout lactation. Analyses were performed using the AIREMLF90 program. Except for the model with the polynomial function of order 5, all models converged. The Wilmink function showed lower values for criteria based on the -2log (L), AIC and BIC. The model with the Legendre polynomial of order 6 showed lower residual variance. Heritability estimates were similar between functions, ranging from 0.07 to 0.18 and were higher from 215 days of lactation. From 155 days of lactation, genetic and permanent environmental correlations between successive controls are of high magnitude. The Wilmink function is the most suitable for the study of milk yields from primiparous Holstein cows. The selection of animals is possible from 155 days of lactation on. Permanent environmental effects have greater influence on the milk production at the end of lactation of primiparous cows and should be considered since they are important and may be cumulative throughout lactation.
650 $aDairy cattle
650 $aHeritability
653 $aModels comparison
653 $aPermanent environmental effects
653 $aRandom regression model
700 1 $aGONÇALVES, T. de M.
700 1 $aSOUZA, J. C. de
700 1 $aRODRIGUEZ, M. A. P.
700 1 $aCOSTA, C. N.
700 1 $aCARVALHEIRA, J. G. V.
773 $tJournal of Agricultural Science$gv. 10, n. 2, 2018.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Amapá; Embrapa Florestas. |
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Data corrente: |
13/03/2000 |
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Data da última atualização: |
04/10/2022 |
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Autoria: |
FARIAS NETO, J. T. de. |
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Afiliação: |
JOAO TOME DE FARIAS NETO, CPAF-AP. |
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Título: |
Estimativas de parâmetros genéticos em progênies de meio-irmãos de pupunheira. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Boletim de Pesquisa Florestal, Colombo, n. 39, p. 109-117, jul./dez. 1999. |
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Idioma: |
Português |
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Conteúdo: |
Avaliou-se o desempenho de 31 progênies de meio-irmãos de pupunheira (Bactris gasipaes) e estimaram-se seus parâmetros genéticos. O experimento foi instalado no Campo Experimental do Matapí, no município de Porto Grande, Estado do Amapá, com as progênies delineadas em blocos ao acaso, com três repetições e parcelas lineares de cinco plantas, no espaçamento de 2,0 m x 1,0 m. Aos quinze meses pós plantio, foram efetuadas medições de altura e diâmetro à altura do colo, comprimento, diâmetro e peso do palmito líquido. Foi realizada a análise estatística e estimados os parâmetros genéticos e fenotípicos. Concluiu-se que a população apresenta variação genética significativa entre famílias para todos os caracteres avaliados; as estimativas de herdabilidade das médias de famílias revelaram bom controle genético para todos os caracteres; as correlações genotípicas entre os caracteres foram altas e positivas (>80%), mostrando a associação favorável entre os mesmos. As estimativas de progressos genéticos com a seleção entre e dentro de famílias foram de 24,5%, 23,3%, 12,0%, 22,1% e 16,5% para peso, comprimento e diâmetro do palmito líquido, altura da planta e diâmetro à altura do colo, respectivamente. |
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Palavras-Chave: |
Correlacao genetica; Genetic correlations; Heart of palm; Heart-of-palm; Melhoramento genetico; Pejibaye. |
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Thesagro: |
Bactris Gasipaes; Palmito; Pupunha. |
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Thesaurus NAL: |
plant breeding. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CNPF-2009-09/4968/1/farias.pdf
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Marc: |
LEADER 01955naa a2200241 a 4500
001 1344142
005 2022-10-04
008 1999 bl uuuu u00u1 u #d
100 1 $aFARIAS NETO, J. T. de
245 $aEstimativas de parâmetros genéticos em progênies de meio-irmãos de pupunheira.
260 $c1999
520 $aAvaliou-se o desempenho de 31 progênies de meio-irmãos de pupunheira (Bactris gasipaes) e estimaram-se seus parâmetros genéticos. O experimento foi instalado no Campo Experimental do Matapí, no município de Porto Grande, Estado do Amapá, com as progênies delineadas em blocos ao acaso, com três repetições e parcelas lineares de cinco plantas, no espaçamento de 2,0 m x 1,0 m. Aos quinze meses pós plantio, foram efetuadas medições de altura e diâmetro à altura do colo, comprimento, diâmetro e peso do palmito líquido. Foi realizada a análise estatística e estimados os parâmetros genéticos e fenotípicos. Concluiu-se que a população apresenta variação genética significativa entre famílias para todos os caracteres avaliados; as estimativas de herdabilidade das médias de famílias revelaram bom controle genético para todos os caracteres; as correlações genotípicas entre os caracteres foram altas e positivas (>80%), mostrando a associação favorável entre os mesmos. As estimativas de progressos genéticos com a seleção entre e dentro de famílias foram de 24,5%, 23,3%, 12,0%, 22,1% e 16,5% para peso, comprimento e diâmetro do palmito líquido, altura da planta e diâmetro à altura do colo, respectivamente.
650 $aplant breeding
650 $aBactris Gasipaes
650 $aPalmito
650 $aPupunha
653 $aCorrelacao genetica
653 $aGenetic correlations
653 $aHeart of palm
653 $aHeart-of-palm
653 $aMelhoramento genetico
653 $aPejibaye
773 $tBoletim de Pesquisa Florestal, Colombo$gn. 39, p. 109-117, jul./dez. 1999.
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Registro original: |
Embrapa Amapá (CPAF-AP) |
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