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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
04/06/2014 |
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Data da última atualização: |
06/02/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
NEVES, H. H.; CARVALHEIRO, R.; O'BRIEN, A. M.; UTSUNOMIYA, Y. T.; CARMO, A. S. do; SCHENKEL, F. S.; SÖLKNER, J.; MCEWAN, J. C.; VAN TASSELL, C. P.; COLE, J. B.; SILVA, M. V. G. B.; QUEIROZ, S. A.; SONSTEGARD, T. S.; GARCIA, J. F. |
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Afiliação: |
Haroldo HR Neves; Roberto Carvalheiro; Ana M Pérez O'Brien; Yuri T Utsunomiya; Adriana S. do Carmo; Flávio S Schenkel; Johann Sölkner; John C McEwan; Curtis P Van Tassell; John B Cole; MARCOS VINICIUS GUALBERTO B SILVA, CNPGL; Sandra A Queiroz; Tad S Sonstegard; José Fernando Garcia. |
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Título: |
Accuracy of genomic predictions in Bos indicus (Nellore) cattle. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Genetics Selection Evolution, v. 46, article 17, 2014. |
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DOI: |
https://doi.org/10.1186/1297-9686-46-17 |
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Idioma: |
Inglês |
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Conteúdo: |
Background- Nellore cattle play an important role in beef production in tropical systems and there is great interest in determining if genomic selection can contribute to accelerate genetic improvement of production and fertility in this breed. We present the first results of the implementation of genomic prediction in a Bos indicus (Nellore) population. Methods - Influential bulls were genotyped with the Illumina Bovine HD chip in order to assess genomic predictive ability for weight and carcass traits, gestation length, scrotal circumference and two selection indices. 685 samples and 320 238 single nucleotide polymorphisms (SNPs) were used in the analyses. A forward-prediction scheme was adopted to predict the genomic breeding values (DGV). In the training step, the estimated breeding values (EBV) of bulls were deregressed (dEBV) and used as pseudo-phenotypes to estimate marker effects using four methods: genomic BLUP with or without a residual polygenic effect (GBLUP20 and GBLUP0, respectively), a mixture model (Bayes C) and Bayesian LASSO (BLASSO). Empirical accuracies of the resulting genomic predictions were assessed based on the correlation between DGV and dEBV for the testing group. Results - Accuracies of genomic predictions ranged from 0.17 (navel at weaning) to 0.74 (finishing precocity). Across traits, Bayesian regression models (Bayes C and BLASSO) were more accurate than GBLUP. The average empirical accuracies were 0.39 (GBLUP0), 0.40 (GBLUP20) and 0.44 (Bayes C and BLASSO). Bayes C and BLASSO tended to produce deflated predictions (i.e. slope of the regression of dEBV on DGV greater than 1). Further analyses suggested that higher-than-expected accuracies were observed for traits for which EBV means differed significantly between two breeding subgroups that were identified in a principal component analysis based on genomic relationships. Conclusions -Bayesian regression models are of interest for future applications of genomic selection in this population, but further improvements are needed to reduce deflation of their predictions. Recurrent updates of the training population would be required to enable accurate prediction of the genetic merit of young animals. The technical feasibility of applying genomic prediction in a Bos indicus (Nellore) population was demonstrated. Further research is needed to permit cost-effective selection decisions using genomic information. MenosBackground- Nellore cattle play an important role in beef production in tropical systems and there is great interest in determining if genomic selection can contribute to accelerate genetic improvement of production and fertility in this breed. We present the first results of the implementation of genomic prediction in a Bos indicus (Nellore) population. Methods - Influential bulls were genotyped with the Illumina Bovine HD chip in order to assess genomic predictive ability for weight and carcass traits, gestation length, scrotal circumference and two selection indices. 685 samples and 320 238 single nucleotide polymorphisms (SNPs) were used in the analyses. A forward-prediction scheme was adopted to predict the genomic breeding values (DGV). In the training step, the estimated breeding values (EBV) of bulls were deregressed (dEBV) and used as pseudo-phenotypes to estimate marker effects using four methods: genomic BLUP with or without a residual polygenic effect (GBLUP20 and GBLUP0, respectively), a mixture model (Bayes C) and Bayesian LASSO (BLASSO). Empirical accuracies of the resulting genomic predictions were assessed based on the correlation between DGV and dEBV for the testing group. Results - Accuracies of genomic predictions ranged from 0.17 (navel at weaning) to 0.74 (finishing precocity). Across traits, Bayesian regression models (Bayes C and BLASSO) were more accurate than GBLUP. The average empirical accuracies were 0.39 (GBLUP0), 0.40 (GBLUP20) and 0.44 (Bayes ... Mostrar Tudo |
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Palavras-Chave: |
Genomic selection; Nellore cattle. |
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Categoria do assunto: |
G Melhoramento Genético |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/116427/1/Cnpgl-2014-Genetics-Selection-Evolution-Accuracy-of-genomic.pdf
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Marc: |
LEADER 03329naa a2200313 a 4500
001 1987574
005 2024-02-06
008 2014 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1186/1297-9686-46-17$2DOI
100 1 $aNEVES, H. H.
245 $aAccuracy of genomic predictions in Bos indicus (Nellore) cattle.$h[electronic resource]
260 $c2014
520 $aBackground- Nellore cattle play an important role in beef production in tropical systems and there is great interest in determining if genomic selection can contribute to accelerate genetic improvement of production and fertility in this breed. We present the first results of the implementation of genomic prediction in a Bos indicus (Nellore) population. Methods - Influential bulls were genotyped with the Illumina Bovine HD chip in order to assess genomic predictive ability for weight and carcass traits, gestation length, scrotal circumference and two selection indices. 685 samples and 320 238 single nucleotide polymorphisms (SNPs) were used in the analyses. A forward-prediction scheme was adopted to predict the genomic breeding values (DGV). In the training step, the estimated breeding values (EBV) of bulls were deregressed (dEBV) and used as pseudo-phenotypes to estimate marker effects using four methods: genomic BLUP with or without a residual polygenic effect (GBLUP20 and GBLUP0, respectively), a mixture model (Bayes C) and Bayesian LASSO (BLASSO). Empirical accuracies of the resulting genomic predictions were assessed based on the correlation between DGV and dEBV for the testing group. Results - Accuracies of genomic predictions ranged from 0.17 (navel at weaning) to 0.74 (finishing precocity). Across traits, Bayesian regression models (Bayes C and BLASSO) were more accurate than GBLUP. The average empirical accuracies were 0.39 (GBLUP0), 0.40 (GBLUP20) and 0.44 (Bayes C and BLASSO). Bayes C and BLASSO tended to produce deflated predictions (i.e. slope of the regression of dEBV on DGV greater than 1). Further analyses suggested that higher-than-expected accuracies were observed for traits for which EBV means differed significantly between two breeding subgroups that were identified in a principal component analysis based on genomic relationships. Conclusions -Bayesian regression models are of interest for future applications of genomic selection in this population, but further improvements are needed to reduce deflation of their predictions. Recurrent updates of the training population would be required to enable accurate prediction of the genetic merit of young animals. The technical feasibility of applying genomic prediction in a Bos indicus (Nellore) population was demonstrated. Further research is needed to permit cost-effective selection decisions using genomic information.
653 $aGenomic selection
653 $aNellore cattle
700 1 $aCARVALHEIRO, R.
700 1 $aO'BRIEN, A. M.
700 1 $aUTSUNOMIYA, Y. T.
700 1 $aCARMO, A. S. do
700 1 $aSCHENKEL, F. S.
700 1 $aSÖLKNER, J.
700 1 $aMCEWAN, J. C.
700 1 $aVAN TASSELL, C. P.
700 1 $aCOLE, J. B.
700 1 $aSILVA, M. V. G. B.
700 1 $aQUEIROZ, S. A.
700 1 $aSONSTEGARD, T. S.
700 1 $aGARCIA, J. F.
773 $tGenetics Selection Evolution$gv. 46, article 17, 2014.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
28/07/1998 |
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Data da última atualização: |
25/07/2019 |
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Autoria: |
VIEIRA, A. R. R.; SCHNEIDER, L.; MARQUES JUNIOR, S.; JUSTINO, R. G. B.; VON ZUCCALMAGLIO, G.; SILVA, J. G. da. |
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Afiliação: |
ANA RITA RODRIGUES VIEIRA, Universidade Federal de Santa Catarina - UFSC/Centro de Ciências Agrárias - CCA/Departamento de Fitotecnia; LINEU SCHNEIDER, Universidade Federal de Santa Catarina - UFSC/Centro de Ciências Agrárias - CCA/Departamento de Fitotecnia; SÉRGIO MARQUES JÚNIOR, Universidade Federal de Santa Catarina - UFSC/Departamento de Engenharia Rural; ROQUE GONZALEZ BOHORA JUSTINO, Universidade Federal de Santa Catarina - UFSC/Centro de Ciências Agrárias - CCA; GERALDO VON ZUCCALMAGLIO, Universidade Federal de Santa Catarina - UFSC/Centro de Ciências Agrárias - CCA; JOSÉ GABRIEL DA SILVA, Universidade Federal de Santa Catarina - UFSC/Centro de Ciências Agrárias - CCA. |
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Título: |
Caracterização térmica e hídrica da cultura do feijão-de-vagem na região da Grande Florianópolis. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 33, n. 6, p. 929-936, jun. 1998 |
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Idioma: |
Português |
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Notas: |
Título em inglês: Thermic and hydric characterization of snap beans for the region of Florianópolis, SC, Brazil. |
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Conteúdo: |
O estudo teve por objetivo determinar a temperatura basal, as somas termicas e o momento de irrigacao da cultura do feijao-de-vagem (Phaseolus vulgaris L.). Foram realizados plantios em dez epocas, com intervalo de 20 dias entre epocas, sendo dois grupos envolvidos: "macarrao" e "manteiga". O delineamento experimental utilizado foi em faixas, com quatro repeticoes dentro de cada epoca de plantio. Os elementos meteorologicos medidos foram temperatura do ar, umidade relativa do ar e precipitacao pluvial. O potencial de agua no solo foi medido por tensiometros instalados a profundidades de 10 cm. Observacoes fenologicas foram feitas juntamente com amostragem do sistema radicular e de area foliar, estimando-se em seguida o indice de area foliar. As somas termicas foram estimadas pelo metodo grau-dia, e a temperatura basal, pelo metodo de interceptacao do eixo X. Os resultados mostraram que os valores de temperatura basal obtidos no periodo do plantio ate a primeira colheita foram 7,03 C e 6,35 C em relacao aos grupos "macarrao" e "manteiga", e as somas termicas, 954 e 1015 graus dias, respectivamente. Com relacao ao momento de irrigacao, verificou-se que ate o periodo da terceira folha trifoliolada o potencial matricial que acusava a necessidade de irrigacao era cerca de -0,015 MPa, e caiu para o -0,025 MPa no inicio do florescimento e, abaixo de -0,030 MPa no periodo da colheita. |
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Palavras-Chave: |
Basal temperature; Heat units; Matricial potential; Potencial matricial; Somas termicas; Temepratura basal. |
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Thesagro: |
Phaseolus Vulgaris. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/92326/1/pab206-96.pdf
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Marc: |
LEADER 02347naa a2200277 a 4500
001 1087116
005 2019-07-25
008 1998 bl uuuu u00u1 u #d
100 1 $aVIEIRA, A. R. R.
245 $aCaracterização térmica e hídrica da cultura do feijão-de-vagem na região da Grande Florianópolis.
260 $c1998
500 $aTítulo em inglês: Thermic and hydric characterization of snap beans for the region of Florianópolis, SC, Brazil.
520 $aO estudo teve por objetivo determinar a temperatura basal, as somas termicas e o momento de irrigacao da cultura do feijao-de-vagem (Phaseolus vulgaris L.). Foram realizados plantios em dez epocas, com intervalo de 20 dias entre epocas, sendo dois grupos envolvidos: "macarrao" e "manteiga". O delineamento experimental utilizado foi em faixas, com quatro repeticoes dentro de cada epoca de plantio. Os elementos meteorologicos medidos foram temperatura do ar, umidade relativa do ar e precipitacao pluvial. O potencial de agua no solo foi medido por tensiometros instalados a profundidades de 10 cm. Observacoes fenologicas foram feitas juntamente com amostragem do sistema radicular e de area foliar, estimando-se em seguida o indice de area foliar. As somas termicas foram estimadas pelo metodo grau-dia, e a temperatura basal, pelo metodo de interceptacao do eixo X. Os resultados mostraram que os valores de temperatura basal obtidos no periodo do plantio ate a primeira colheita foram 7,03 C e 6,35 C em relacao aos grupos "macarrao" e "manteiga", e as somas termicas, 954 e 1015 graus dias, respectivamente. Com relacao ao momento de irrigacao, verificou-se que ate o periodo da terceira folha trifoliolada o potencial matricial que acusava a necessidade de irrigacao era cerca de -0,015 MPa, e caiu para o -0,025 MPa no inicio do florescimento e, abaixo de -0,030 MPa no periodo da colheita.
650 $aPhaseolus Vulgaris
653 $aBasal temperature
653 $aHeat units
653 $aMatricial potential
653 $aPotencial matricial
653 $aSomas termicas
653 $aTemepratura basal
700 1 $aSCHNEIDER, L.
700 1 $aMARQUES JUNIOR, S.
700 1 $aJUSTINO, R. G. B.
700 1 $aVON ZUCCALMAGLIO, G.
700 1 $aSILVA, J. G. da
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 33, n. 6, p. 929-936, jun. 1998
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Embrapa Unidades Centrais (AI-SEDE) |
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