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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: |
KERN, E. L.; COBUCI, J. A.; COSTA, C. N.; DUCROCQ, V. |
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Afiliação: |
Elisandra Lurdes Kern, UFRGS; Jaime Araujo Cobuci, UFRGS; CLAUDIO NAPOLIS COSTA, CNPGL; Vincent Ducrocq, French National Institute for Agricultural Research. |
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Título: |
Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Scientia Agricola, v. 75, n. 6, p. 470-478, 2018. |
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DOI: |
10.1590/1678-992X-2017-0153 |
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Idioma: |
Inglês |
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Conteúdo: |
ABSTRACT: Longevity is an important trait due to its relationship with profitability. Type traits have been used as indirect predictors for productive life. The objective of this study was to evaluate the relationship of 20 type traits on length of productive life in Brazilian Holsteins, using a piecewise Weibull proportional hazard model. Three analyses were performed i) productive life was corrected for within herd level of production as a proxy for functional longevity, which included the time-dependent effects of region within year, class of milk production within herdyear, milk production class within lactation number, fat class and protein contents within herd and (variation in) herd size as well as the time-independent fixed effect of age at first calving and the type trait score; ii) the effects related to production were omitted from the first model (true longevity) and iii) with the first model, the effect of type was also studied considering five classes of percentage of type-scored cows within the herd. All analyses were performed using the Survival Kit program. The final score, angularity, top line, udder texture and suspensory ligament showed the strongest relationship with productive life. When type traits were available only for a small fraction of the herd, the cows had a better chance of remaining longer in the herd. The absence of type trait phenotypes was associated with a strong increase of culling risk for the cows. Type traits were not found to be good indirect predictors of productive life in Brazil. MenosABSTRACT: Longevity is an important trait due to its relationship with profitability. Type traits have been used as indirect predictors for productive life. The objective of this study was to evaluate the relationship of 20 type traits on length of productive life in Brazilian Holsteins, using a piecewise Weibull proportional hazard model. Three analyses were performed i) productive life was corrected for within herd level of production as a proxy for functional longevity, which included the time-dependent effects of region within year, class of milk production within herdyear, milk production class within lactation number, fat class and protein contents within herd and (variation in) herd size as well as the time-independent fixed effect of age at first calving and the type trait score; ii) the effects related to production were omitted from the first model (true longevity) and iii) with the first model, the effect of type was also studied considering five classes of percentage of type-scored cows within the herd. All analyses were performed using the Survival Kit program. The final score, angularity, top line, udder texture and suspensory ligament showed the strongest relationship with productive life. When type traits were available only for a small fraction of the herd, the cows had a better chance of remaining longer in the herd. The absence of type trait phenotypes was associated with a strong increase of culling risk for the cows. Type traits were not found to be good... Mostrar Tudo |
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Palavras-Chave: |
Conformation traits; Culling risk; Survival analysis. |
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Thesaurus Nal: |
Dairy cattle; Longevity. |
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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/190361/1/Artigo-SciAgricola-Claudio-Phenotypic.pdf
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Marc: |
LEADER 02250naa a2200229 a 4500
001 2103810
005 2023-01-24
008 2018 bl uuuu u00u1 u #d
024 7 $a10.1590/1678-992X-2017-0153$2DOI
100 1 $aKERN, E. L.
245 $aPhenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model.$h[electronic resource]
260 $c2018
520 $aABSTRACT: Longevity is an important trait due to its relationship with profitability. Type traits have been used as indirect predictors for productive life. The objective of this study was to evaluate the relationship of 20 type traits on length of productive life in Brazilian Holsteins, using a piecewise Weibull proportional hazard model. Three analyses were performed i) productive life was corrected for within herd level of production as a proxy for functional longevity, which included the time-dependent effects of region within year, class of milk production within herdyear, milk production class within lactation number, fat class and protein contents within herd and (variation in) herd size as well as the time-independent fixed effect of age at first calving and the type trait score; ii) the effects related to production were omitted from the first model (true longevity) and iii) with the first model, the effect of type was also studied considering five classes of percentage of type-scored cows within the herd. All analyses were performed using the Survival Kit program. The final score, angularity, top line, udder texture and suspensory ligament showed the strongest relationship with productive life. When type traits were available only for a small fraction of the herd, the cows had a better chance of remaining longer in the herd. The absence of type trait phenotypes was associated with a strong increase of culling risk for the cows. Type traits were not found to be good indirect predictors of productive life in Brazil.
650 $aDairy cattle
650 $aLongevity
653 $aConformation traits
653 $aCulling risk
653 $aSurvival analysis
700 1 $aCOBUCI, J. A.
700 1 $aCOSTA, C. N.
700 1 $aDUCROCQ, V.
773 $tScientia Agricola$gv. 75, n. 6, p. 470-478, 2018.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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Registro Completo
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Biblioteca(s): |
Embrapa Agrossilvipastoril. |
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Data corrente: |
24/02/2021 |
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Data da última atualização: |
24/02/2021 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
SANTOS, J. A. F. dos; CLEMENTE, R. A.; NASCIMENTO, A. F. do; FERREIRA, A. |
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Afiliação: |
JUSSANE ANTUNES FOGAÇA DOS SANTOS, UFMT, Sinop-MT; RAFAEL ALANIS CLEMENTE, UNIFAMA, Guarantã do Norte-MT; ALEXANDRE FERREIRA DO NASCIMENTO, CPAMT; ANDERSON FERREIRA, CPAMT. |
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Título: |
Mudanças nos teores de nitrato e amônio no solo causados pelo uso de inibidores de urease e nitrificação. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
In: ENCONTRO DE CIÊNCIA E TECNOLOGIAS AGROSSUSTENTÁVEIS, 4.; JORNADA CIENTÍFICA DA EMBRAPA AGROSSILVIPASTORIL, 9., 2020, Sinop. Resumos... Brasília, DF: Embrapa, 2020. p. 53. |
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Idioma: |
Português |
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Conteúdo: |
Os inibidores de urease (U) e nitrificação (Nit) podem ser usados com aditivo à ureia a fim de minimizar as perdas de nitrogênio (N). Outra forma de potencializar a disponibilidade de N é através da inoculação com Azospirillum brasilense. Objetivou-se com este trabalho avaliar as mudanças na disponibilidade de amônio (NH4 +) e nitrato (NO3 -) no solo após inoculação e aplicação de ureia com U, N-(n-butil) triamida (NBPT), e com Nit, dicianodiamida (DCD), na cultura do milho em sucessão à soja. O delineamento experimental foi de blocos ao acabo em esquema de parcela subdividida conduzido na segunda safra de milho de 2017 numa área experimental da Embrapa Agrossilvipastoril. Os tratamentos das parcelas constaram da ausência ou presença de inoculação com Azospirillum brasilense e os tratamentos das subparcelas foram: aplicação de 100% da dose recomendada de adubação de N (120 kg ha-1) (100); 100% da dose mais adição de U e Nit (100+U+Nit); 100% da dose mais U (100+U), 100% da dose mais Nit (100+Nit) e um tratamento controle (testemunha). As coletas foram realizadas 4 amostragens após a aplicação dos tratamentos, e os teores de NH4 + e NO3 - das amostras foram obtidos por espectrofotometria, após extração em cloreto de potássio. |
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Palavras-Chave: |
Amônio; Inibidor; Mato Grosso; Sinop-MT. |
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Thesagro: |
Inoculação; Microbiologia; Microbiologia do Solo; Nitrato; Nitrificação; Uréase. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/221441/1/2020-cpamt-afn-mundaca-teor-nitrato-amonio-solo-causado-uso-inibidor-urease-nitrificacao-p-53.pdf
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Marc: |
LEADER 02181nam a2200265 a 4500
001 2130247
005 2021-02-24
008 2020 bl uuuu u00u1 u #d
100 1 $aSANTOS, J. A. F. dos
245 $aMudanças nos teores de nitrato e amônio no solo causados pelo uso de inibidores de urease e nitrificação.$h[electronic resource]
260 $aIn: ENCONTRO DE CIÊNCIA E TECNOLOGIAS AGROSSUSTENTÁVEIS, 4.; JORNADA CIENTÍFICA DA EMBRAPA AGROSSILVIPASTORIL, 9., 2020, Sinop. Resumos... Brasília, DF: Embrapa, 2020. p. 53.$c2020
520 $aOs inibidores de urease (U) e nitrificação (Nit) podem ser usados com aditivo à ureia a fim de minimizar as perdas de nitrogênio (N). Outra forma de potencializar a disponibilidade de N é através da inoculação com Azospirillum brasilense. Objetivou-se com este trabalho avaliar as mudanças na disponibilidade de amônio (NH4 +) e nitrato (NO3 -) no solo após inoculação e aplicação de ureia com U, N-(n-butil) triamida (NBPT), e com Nit, dicianodiamida (DCD), na cultura do milho em sucessão à soja. O delineamento experimental foi de blocos ao acabo em esquema de parcela subdividida conduzido na segunda safra de milho de 2017 numa área experimental da Embrapa Agrossilvipastoril. Os tratamentos das parcelas constaram da ausência ou presença de inoculação com Azospirillum brasilense e os tratamentos das subparcelas foram: aplicação de 100% da dose recomendada de adubação de N (120 kg ha-1) (100); 100% da dose mais adição de U e Nit (100+U+Nit); 100% da dose mais U (100+U), 100% da dose mais Nit (100+Nit) e um tratamento controle (testemunha). As coletas foram realizadas 4 amostragens após a aplicação dos tratamentos, e os teores de NH4 + e NO3 - das amostras foram obtidos por espectrofotometria, após extração em cloreto de potássio.
650 $aInoculação
650 $aMicrobiologia
650 $aMicrobiologia do Solo
650 $aNitrato
650 $aNitrificação
650 $aUréase
653 $aAmônio
653 $aInibidor
653 $aMato Grosso
653 $aSinop-MT
700 1 $aCLEMENTE, R. A.
700 1 $aNASCIMENTO, A. F. do
700 1 $aFERREIRA, A.
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Embrapa Agrossilvipastoril (CPAMT) |
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