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| 1. |  | AITA, C.; SEVERO, D.; GIACOMINI, S. J.; URQUIAGA, S.; JANTALIA, C. P.; TITON, M. A.; CANABARRO, D. V. N.; BACKENDORI, R. Fornecimento de nitrogênio ao milho com o uso de dejetos líquidos de suínos. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 30., 2005, Recife. Solos: sustentabilidade e qualidade ambiental. Recife: Sociedade Brasileira de Ciência do Solo, 2005. 4 p. CD ROM.| Biblioteca(s): Embrapa Agrobiologia. |
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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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Circulação/Nível: |
A - 1 |
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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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