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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados; Embrapa Meio Ambiente. |
Data corrente: |
22/12/1993 |
Data da última atualização: |
23/04/1999 |
Autoria: |
SANTOS, A. F. dos. |
Título: |
Isolamento e selecao de antagonistas com potencial para controle biologico de Sclerotinia sclerotiorum. |
Ano de publicação: |
1980 |
Fonte/Imprenta: |
Vicosa: UFV, 1980. |
Páginas: |
32p. |
Idioma: |
Português |
Notas: |
Tese Mestrado. |
Conteúdo: |
Neste trabalho, objetivou-se isolar e selecionar antagonistas com potencial para controle biologico de Sclerotinia sclerotiorum. Fungos antagonistas a S. sclerotiorum foram isolados de amostras de solo coletadas nos municipios de Vicosa e Igarape, Estado de Minas Gerais. Avaliou-se a efetividade desses fungos como antagonistas em condicoes "in vitro" e em solo. No ensaio "in vitro", testou-se a eficacia dos antagonistas, nas concentracoes 10 4, 10 6 e 10 8 esporos/ml, nos periodos de incubacao de 7 a 15 dias. Verificou-se que os isolados de Trichoderma Koningii Tk2 e Tk5, T. harzianum Th1 e Trichothecium roseum foram os que proporciaram maiores reducoes no numero medio de esclerodios viaveis. Observou-se maior eficacia dos antagonistas nas concentracoes de 10 3 e 10 8 esporos/ml, em ambos os periodos de incubacao. No periodo de incubacao de 15 dias, em todos os tratamentos, foi observado maior numero de esclerodios apodrecidos. Estudou-se, ainda, em solo, a efetividade dos antagonistas nas concentracoes de 10 4, 10 6 e 10 8 esporos/grama de solo, nos periodos de incubacao de 20, 40 e 60 dias. Constatou-se que os isolados de T. Koningii Tk2 e Tk5, T. harzianum Th1, Gliocladium sp. G1 e G2 tenderam a se comportar como os antagonistas mais eficazes na reducao do numero medio de esclerodios adicionados nas camadas superior e inferior do solo. Os antagonistas testados apresentaram maior efetividade no periodo de incunbacao de 60 dias, o mais longo do teste. |
Palavras-Chave: |
Brasil; Fungal diseases; Igarape; Minas Gerais; Vicosa. |
Thesagro: |
Controle Biológico; Doença Fúngica; Fungo; Podridão da Haste; Sclerotinia Sclerotiorum. |
Thesaurus Nal: |
biological control; Brazil. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02211nam a2200277 a 4500 001 1563290 005 1999-04-23 008 1980 bl uuuu m 00u1 u #d 100 1 $aSANTOS, A. F. dos 245 $aIsolamento e selecao de antagonistas com potencial para controle biologico de Sclerotinia sclerotiorum. 260 $aVicosa: UFV$c1980 300 $a32p. 500 $aTese Mestrado. 520 $aNeste trabalho, objetivou-se isolar e selecionar antagonistas com potencial para controle biologico de Sclerotinia sclerotiorum. Fungos antagonistas a S. sclerotiorum foram isolados de amostras de solo coletadas nos municipios de Vicosa e Igarape, Estado de Minas Gerais. Avaliou-se a efetividade desses fungos como antagonistas em condicoes "in vitro" e em solo. No ensaio "in vitro", testou-se a eficacia dos antagonistas, nas concentracoes 10 4, 10 6 e 10 8 esporos/ml, nos periodos de incubacao de 7 a 15 dias. Verificou-se que os isolados de Trichoderma Koningii Tk2 e Tk5, T. harzianum Th1 e Trichothecium roseum foram os que proporciaram maiores reducoes no numero medio de esclerodios viaveis. Observou-se maior eficacia dos antagonistas nas concentracoes de 10 3 e 10 8 esporos/ml, em ambos os periodos de incubacao. No periodo de incubacao de 15 dias, em todos os tratamentos, foi observado maior numero de esclerodios apodrecidos. Estudou-se, ainda, em solo, a efetividade dos antagonistas nas concentracoes de 10 4, 10 6 e 10 8 esporos/grama de solo, nos periodos de incubacao de 20, 40 e 60 dias. Constatou-se que os isolados de T. Koningii Tk2 e Tk5, T. harzianum Th1, Gliocladium sp. G1 e G2 tenderam a se comportar como os antagonistas mais eficazes na reducao do numero medio de esclerodios adicionados nas camadas superior e inferior do solo. Os antagonistas testados apresentaram maior efetividade no periodo de incunbacao de 60 dias, o mais longo do teste. 650 $abiological control 650 $aBrazil 650 $aControle Biológico 650 $aDoença Fúngica 650 $aFungo 650 $aPodridão da Haste 650 $aSclerotinia Sclerotiorum 653 $aBrasil 653 $aFungal diseases 653 $aIgarape 653 $aMinas Gerais 653 $aVicosa
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Embrapa Cerrados (CPAC) |
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![](/consulta/web/img/deny.png) | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
27/01/2016 |
Data da última atualização: |
27/01/2016 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 2 |
Autoria: |
YOKOO, M. J. I.; LÔBO, R. B.; MAGNABOSCO, C. de U.; ROSA, G. J. M.; FORNI, S.; SAINZ, R. D.; ALBUQUERQUE, L. G. |
Afiliação: |
MARCOS JUN ITI YOKOO, CPPSUL; R. B. Lôbo, Associação Nacional de Criadores e Pesquisadores; CLAUDIO DE ULHOA MAGNABOSCO, CPAC; G. J. M. Rosa, University of Wisconsin; S. Forni, Dow AgroSciences; R. D. Sainz, University of California; L. G. Albuquerque, UNESP. |
Título: |
Genetic correlation of traits measured by ultrasound at yearling and 18 months of age in Nellore beef cattle. |
Ano de publicação: |
2015 |
Fonte/Imprenta: |
Livestock Science, v. 180, p. 34-40, Oct. 2015. |
DOI: |
10.1016/j.livsci.2015.07.003 |
Idioma: |
Inglês |
Conteúdo: |
The objective of this study was to estimate genetic parameters for carcass traits measured by ultrasound at yearling (Y) and 18 months of age (post-yearling, PY) in order to identify the most appropriate age for the measurement of these traits used for the selection of Nellore beef cattle. In addition, genetic correlations were estimated between these carcass traits and between carcass and other economically important traits such as scrotal circumference, weight, hip height at 18 months of age, age at first calving, and first calving interval (FCI). The carcass traits were longissimus muscle area (LMA), backfat thickness (BF), and rump fat thickness (RF) recorded at two different ages (Y and PY). Gibbs sampling was applied to estimate the genetic parameters using multiple trait animal model. The estimates of posterior heritabilities and standard deviations (SD) for the carcass traits were 0.46, SD=0.06 (LMA_Y), 0.42, SD=0.07 (BF_Y), 0.60, SD=0.09 (RF_Y), 0.33, SD=0.06 (LMA_PY), 0.59, SD=0.08 (BF_PY), and 0.55, SD=0.09 (RF_PY). The genetic parameters obtained in this study suggest the existence of genetic variability in all carcass traits at both ages. Hip height was negatively correlated with BF_PY and RF_PY, indicating that selection of taller animals may lead to animals that will deposit less subcutaneous fat. Selection for growth and carcass traits will not affect FCI, except for an increase in BF_PY which will increase FCI in the long term, possibly due to a correlated response, once the genetic correlation is moderate (0.40, SD= 0.17), and the posterior heritability for FCI was relatively low (0.11, SD= 0.03). The traits LMA, BF and RF measured at Y and at PY are practically the same traits since the genetic correlation are 0.83 (SD= 0.06), 0.94 (SD= 0.02) and 0.72 (SD= 0.07), respectively. In conclusion, ultrasound carcass traits should respond rapidly to selection and can be recorded only in one age, at Y or at PY. Furthermore, there is no need to include the two subcutaneous fat thickness measures (BF and RF) in selection criteria since they are highly genetic correlated. Genetic progress for these carcass traits can be achieved without affecting the breeding value of animals for other economic traits, since the most of genetic correlation estimates are favorable and of low magnitude. MenosThe objective of this study was to estimate genetic parameters for carcass traits measured by ultrasound at yearling (Y) and 18 months of age (post-yearling, PY) in order to identify the most appropriate age for the measurement of these traits used for the selection of Nellore beef cattle. In addition, genetic correlations were estimated between these carcass traits and between carcass and other economically important traits such as scrotal circumference, weight, hip height at 18 months of age, age at first calving, and first calving interval (FCI). The carcass traits were longissimus muscle area (LMA), backfat thickness (BF), and rump fat thickness (RF) recorded at two different ages (Y and PY). Gibbs sampling was applied to estimate the genetic parameters using multiple trait animal model. The estimates of posterior heritabilities and standard deviations (SD) for the carcass traits were 0.46, SD=0.06 (LMA_Y), 0.42, SD=0.07 (BF_Y), 0.60, SD=0.09 (RF_Y), 0.33, SD=0.06 (LMA_PY), 0.59, SD=0.08 (BF_PY), and 0.55, SD=0.09 (RF_PY). The genetic parameters obtained in this study suggest the existence of genetic variability in all carcass traits at both ages. Hip height was negatively correlated with BF_PY and RF_PY, indicating that selection of taller animals may lead to animals that will deposit less subcutaneous fat. Selection for growth and carcass traits will not affect FCI, except for an increase in BF_PY which will increase FCI in the long term, possibly due to a correlated r... Mostrar Tudo |
Palavras-Chave: |
Ultra-Som. |
Thesagro: |
Carcaça; Gado de corte. |
Categoria do assunto: |
-- |
Marc: |
LEADER 03033naa a2200241 a 4500 001 2035334 005 2016-01-27 008 2015 bl --- 0-- u #d 024 7 $a10.1016/j.livsci.2015.07.003$2DOI 100 1 $aYOKOO, M. J. I. 245 $aGenetic correlation of traits measured by ultrasound at yearling and 18 months of age in Nellore beef cattle. 260 $c2015 520 $aThe objective of this study was to estimate genetic parameters for carcass traits measured by ultrasound at yearling (Y) and 18 months of age (post-yearling, PY) in order to identify the most appropriate age for the measurement of these traits used for the selection of Nellore beef cattle. In addition, genetic correlations were estimated between these carcass traits and between carcass and other economically important traits such as scrotal circumference, weight, hip height at 18 months of age, age at first calving, and first calving interval (FCI). The carcass traits were longissimus muscle area (LMA), backfat thickness (BF), and rump fat thickness (RF) recorded at two different ages (Y and PY). Gibbs sampling was applied to estimate the genetic parameters using multiple trait animal model. The estimates of posterior heritabilities and standard deviations (SD) for the carcass traits were 0.46, SD=0.06 (LMA_Y), 0.42, SD=0.07 (BF_Y), 0.60, SD=0.09 (RF_Y), 0.33, SD=0.06 (LMA_PY), 0.59, SD=0.08 (BF_PY), and 0.55, SD=0.09 (RF_PY). The genetic parameters obtained in this study suggest the existence of genetic variability in all carcass traits at both ages. Hip height was negatively correlated with BF_PY and RF_PY, indicating that selection of taller animals may lead to animals that will deposit less subcutaneous fat. Selection for growth and carcass traits will not affect FCI, except for an increase in BF_PY which will increase FCI in the long term, possibly due to a correlated response, once the genetic correlation is moderate (0.40, SD= 0.17), and the posterior heritability for FCI was relatively low (0.11, SD= 0.03). The traits LMA, BF and RF measured at Y and at PY are practically the same traits since the genetic correlation are 0.83 (SD= 0.06), 0.94 (SD= 0.02) and 0.72 (SD= 0.07), respectively. In conclusion, ultrasound carcass traits should respond rapidly to selection and can be recorded only in one age, at Y or at PY. Furthermore, there is no need to include the two subcutaneous fat thickness measures (BF and RF) in selection criteria since they are highly genetic correlated. Genetic progress for these carcass traits can be achieved without affecting the breeding value of animals for other economic traits, since the most of genetic correlation estimates are favorable and of low magnitude. 650 $aCarcaça 650 $aGado de corte 653 $aUltra-Som 700 1 $aLÔBO, R. B. 700 1 $aMAGNABOSCO, C. de U. 700 1 $aROSA, G. J. M. 700 1 $aFORNI, S. 700 1 $aSAINZ, R. D. 700 1 $aALBUQUERQUE, L. G. 773 $tLivestock Science$gv. 180, p. 34-40, Oct. 2015.
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