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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
07/04/2010 |
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Data da última atualização: |
24/02/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ALBUQUERQUE, M. P. de; MACHADO, A. M. B.; MACHADO, A. de F.; VICTORIA, F. de C.; MORSELLI, T. B. G. A. |
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Afiliação: |
MARGELI PEREIRA DE ALBUQUERQUE, UFPel; ANTONIO MACIEL BOTELHO MACHADO, CNPF; AIDÊ DE FREITAS MACHADO, UFPel; Doutorando UFPel; TÂNIA BEATRIZ GAMBOA ARAÚJO MORSELLI, UFPel. |
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Título: |
Fauna edáfica em sistema de plantio homogêneo, sistema agroflorestal e em mata nativa em dois municípios do Rio Grande do Sul, Brasil. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Biociências, Porto Alegre, v. 17, n. 1, p. 59-66, dez. 2009. |
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Idioma: |
Português |
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Conteúdo: |
Edaphic fauna in homogeneous plantation, agroforestry and native bush systems at two cities in Rio Grande do Sul, Brasil. The soil fauna composition was evaluated in three environments. The present work, was analyzed the relations of the distinct groups of organisms in two different crop systems (homogeneous crop system, agroforestry system), beyond an area of native vegetation at South Half of the Rio Grande do Sul, in the Morro Redondo and Pinheiro Machado cities. The material collection occurred in the Abril/2007 maio/2007 period. The collections had been made by the use of Tretzel and Tullgren extractors. Five points had been sampled equidistant 20m each other and following an only line or squares depending on the relief. They are presented the total of organisms in each environment, the more frequent group, index of similarity and diversity in each environment. Collembola predominance was observed in the agroforestry system and Araneae in the homogeneous plantation and native vegetation. The differences found in the taxonomic diversity and frequency of each taxa in study environments are presented. |
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Palavras-Chave: |
Diversidade; Sistema agrícola. |
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Thesagro: |
Fauna Edáfica. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01807naa a2200205 a 4500
001 1663369
005 2015-02-24
008 2009 bl uuuu u00u1 u #d
100 1 $aALBUQUERQUE, M. P. de
245 $aFauna edáfica em sistema de plantio homogêneo, sistema agroflorestal e em mata nativa em dois municípios do Rio Grande do Sul, Brasil.$h[electronic resource]
260 $c2009
520 $aEdaphic fauna in homogeneous plantation, agroforestry and native bush systems at two cities in Rio Grande do Sul, Brasil. The soil fauna composition was evaluated in three environments. The present work, was analyzed the relations of the distinct groups of organisms in two different crop systems (homogeneous crop system, agroforestry system), beyond an area of native vegetation at South Half of the Rio Grande do Sul, in the Morro Redondo and Pinheiro Machado cities. The material collection occurred in the Abril/2007 maio/2007 period. The collections had been made by the use of Tretzel and Tullgren extractors. Five points had been sampled equidistant 20m each other and following an only line or squares depending on the relief. They are presented the total of organisms in each environment, the more frequent group, index of similarity and diversity in each environment. Collembola predominance was observed in the agroforestry system and Araneae in the homogeneous plantation and native vegetation. The differences found in the taxonomic diversity and frequency of each taxa in study environments are presented.
650 $aFauna Edáfica
653 $aDiversidade
653 $aSistema agrícola
700 1 $aMACHADO, A. M. B.
700 1 $aMACHADO, A. de F.
700 1 $aVICTORIA, F. de C.
700 1 $aMORSELLI, T. B. G. A.
773 $tBiociências, Porto Alegre$gv. 17, n. 1, p. 59-66, dez. 2009.
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Embrapa Florestas (CNPF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sul. |
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Data corrente: |
15/07/2019 |
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Data da última atualização: |
23/10/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
SOLLERO, B. P.; HOWARD, J. T.; SPANGLER, M. L. |
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Afiliação: |
BRUNA PENA SOLLERO, CPPSUL; Jeremy T Howard; Matthew L Spangler. |
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Título: |
The impact of reducing the frequency of animals genotyped at higher density on imputation and prediction accuracies using ssGBLUP. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Journal of Animal Science, v. 97, n. 7, p. 2780-2792, July 2019. |
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DOI: |
doi-org.ez103.periodicos.capes.gov.br/10.1093/jas/skz147 |
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Idioma: |
Inglês |
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Conteúdo: |
The largest gains in accuracy in a genomic selection program come from genotyping young selection candidates who have not yet produced progeny and who might, or might not, have a phenotypic record recorded. To reduce genotyping costs and to allow for an increased amount of genomic data to be available in a population, young selection candidates may be genotyped with low-density (LD) panels and imputed to a higher density. However, to ensure that a reasonable imputation accuracy persists overtime, some parent animals originally genotyped at LD must be re-genotyped at a higher density. This study investigated the long-term impact of selectively re-genotyping parents with a medium-density (MD) SNP panel on the accuracy of imputation and on the genetic predictions using ssGBLUP in a simulated beef cattle population. Assuming a moderately heritable trait (0.25) and a population undergoing selection, the simulation generated sequence data for a founder population (100 male and 500 female individuals) and 9,000 neutral markers, considered as the MD panel. All selection candidates from generation 8 to 15 were genotyped with LD panels corresponding to a density of 0.5% (LD_0.5), 2% (LD_2), and 5% (LD_5) of the MD. Re-genotyping scenarios chose parents at random or based on EBV and ranged from 10% of male parents to re-genotyping all male and female parents with MD. Ranges in average imputation accuracy at generation 15 were 0.567 to 0.936, 0.795 to 0.985, and 0.931 to 0.995 for the LD_0.5, LD_2, and LD_5, respectively, and the average EBV accuracies ranged from 0.453 to 0.735, 0.631 to 0.784, and 0.748 to 0.807 for LD_0.5, LD_2, and LD_5, respectively. Re-genotyping parents based on their EBV resulted in higher imputation and EBV accuracies compared to selecting parents at random and these values increased with the size of LD panels. Differences between re-genotyping scenarios decreased when the density of the LD panel increased, suggesting fewer animals needed to be re-genotyped to achieve higher accuracies. In general, imputation and EBV accuracies were greater when more parents were re-genotyped, independent of the proportion of males and females. In practice, the relationship between the density of the LD panel used and the target panel must be considered to determine the number (proportion) of animals that would need to be re-genotyped to enable sufficient imputation accuracy. MenosThe largest gains in accuracy in a genomic selection program come from genotyping young selection candidates who have not yet produced progeny and who might, or might not, have a phenotypic record recorded. To reduce genotyping costs and to allow for an increased amount of genomic data to be available in a population, young selection candidates may be genotyped with low-density (LD) panels and imputed to a higher density. However, to ensure that a reasonable imputation accuracy persists overtime, some parent animals originally genotyped at LD must be re-genotyped at a higher density. This study investigated the long-term impact of selectively re-genotyping parents with a medium-density (MD) SNP panel on the accuracy of imputation and on the genetic predictions using ssGBLUP in a simulated beef cattle population. Assuming a moderately heritable trait (0.25) and a population undergoing selection, the simulation generated sequence data for a founder population (100 male and 500 female individuals) and 9,000 neutral markers, considered as the MD panel. All selection candidates from generation 8 to 15 were genotyped with LD panels corresponding to a density of 0.5% (LD_0.5), 2% (LD_2), and 5% (LD_5) of the MD. Re-genotyping scenarios chose parents at random or based on EBV and ranged from 10% of male parents to re-genotyping all male and female parents with MD. Ranges in average imputation accuracy at generation 15 were 0.567 to 0.936, 0.795 to 0.985, and 0.931 to 0.995 for the L... Mostrar Tudo |
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Palavras-Chave: |
Coeficiente de parentesco; Habilidade preditiva; Herdabilidade; Validação cruzada. |
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Thesagro: |
Melhoramento Genético Animal; Seleção Genótipa. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03224naa a2200229 a 4500
001 2110612
005 2019-10-23
008 2019 bl uuuu u00u1 u #d
024 7 $adoi-org.ez103.periodicos.capes.gov.br/10.1093/jas/skz147$2DOI
100 1 $aSOLLERO, B. P.
245 $aThe impact of reducing the frequency of animals genotyped at higher density on imputation and prediction accuracies using ssGBLUP.$h[electronic resource]
260 $c2019
520 $aThe largest gains in accuracy in a genomic selection program come from genotyping young selection candidates who have not yet produced progeny and who might, or might not, have a phenotypic record recorded. To reduce genotyping costs and to allow for an increased amount of genomic data to be available in a population, young selection candidates may be genotyped with low-density (LD) panels and imputed to a higher density. However, to ensure that a reasonable imputation accuracy persists overtime, some parent animals originally genotyped at LD must be re-genotyped at a higher density. This study investigated the long-term impact of selectively re-genotyping parents with a medium-density (MD) SNP panel on the accuracy of imputation and on the genetic predictions using ssGBLUP in a simulated beef cattle population. Assuming a moderately heritable trait (0.25) and a population undergoing selection, the simulation generated sequence data for a founder population (100 male and 500 female individuals) and 9,000 neutral markers, considered as the MD panel. All selection candidates from generation 8 to 15 were genotyped with LD panels corresponding to a density of 0.5% (LD_0.5), 2% (LD_2), and 5% (LD_5) of the MD. Re-genotyping scenarios chose parents at random or based on EBV and ranged from 10% of male parents to re-genotyping all male and female parents with MD. Ranges in average imputation accuracy at generation 15 were 0.567 to 0.936, 0.795 to 0.985, and 0.931 to 0.995 for the LD_0.5, LD_2, and LD_5, respectively, and the average EBV accuracies ranged from 0.453 to 0.735, 0.631 to 0.784, and 0.748 to 0.807 for LD_0.5, LD_2, and LD_5, respectively. Re-genotyping parents based on their EBV resulted in higher imputation and EBV accuracies compared to selecting parents at random and these values increased with the size of LD panels. Differences between re-genotyping scenarios decreased when the density of the LD panel increased, suggesting fewer animals needed to be re-genotyped to achieve higher accuracies. In general, imputation and EBV accuracies were greater when more parents were re-genotyped, independent of the proportion of males and females. In practice, the relationship between the density of the LD panel used and the target panel must be considered to determine the number (proportion) of animals that would need to be re-genotyped to enable sufficient imputation accuracy.
650 $aMelhoramento Genético Animal
650 $aSeleção Genótipa
653 $aCoeficiente de parentesco
653 $aHabilidade preditiva
653 $aHerdabilidade
653 $aValidação cruzada
700 1 $aHOWARD, J. T.
700 1 $aSPANGLER, M. L.
773 $tJournal of Animal Science$gv. 97, n. 7, p. 2780-2792, July 2019.
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